Rust Programming Language Programmieren in Rust (Full lecture, German), 5 Dec 2016

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From YouTube: Programmieren in Rust (05.12.): Iteratoren und Closures

Description

Vorlesung „Programmieren in Rust“ an der Universität Osnabrück im Wintersemester 2016/17.

Dies ist die Aufnahme des Beamerbildes sowie des Notebook-Mikrofons. Alternative Aufnahme (mit Dozentenvideo): https://video4.virtuos.uos.de/engage/theodul/ui/core.html?id=e4db0cac-c233-4ae7-9c62-5cd1d6e2ab16

Slides und weitere Informationen: https://github.com/LukasKalbertodt/programmieren-in-rust

Playlist: https://www.youtube.com/playlist?list=PL0Ur-09iGhpwMbNiVTBeHmIjs0GuIXhNg

A

Welcome at least the feeling will be, but I was already together. I wanted to start talking a little bit today, because I was aware there are only two weeks conquered, so I grew up with it from a few days.

A

It's not like that at all anymore far, and in these two weeks we will mainly deal with meaningful things in that we will still get to know things new things to understand rast better and in particular I always think how much percentage of the lecture, how much percentage of the standard library we already understand. Children use it, for example,. When you didn’t know trades yet,, you couldn’t use many, many functions of the city lahr it somehow very much is done with trades.

A

When you didn’t understand at all how the island works in one way or another, of course, could hardly that standard magic. We will do the rest before christmas that almost everything from the city location can be used here. So I always think that in the sense of lern corinna used for almost everything after christmas busy, but mainly so that the rather difficult and concepts interros understand that that system programming. That means we will definitely deal with memory layout and stuff like that live tiles will of.

B

Course also deal with a lot of.

A

Things and even now we won't be able to express a lot of functions until christmas, but we know our live cams. That's coming everything after christmas, then that we'll go into the nasty details of system programming to understand a bit more and then there's parallel programming and other stuff I want to scare you too much. It won't be as bad as it is sounds like it does,. But then, in any case, the focus is more on system programming and we also take a look at what a compiler then spits out while I forgot.

B

A

Before Christmas I will probably talk to you briefly sometime in the next week because of the project work at some point you have to choose a topic and I wanted to at least throw a few ideas around before christmas, so that we have time over christmas to think about maybe developing our own ideas simply so that the drivers have inspiration that we could do with the project work up until christmas.

A

You probably worked on a big project, first doing the homework with the little ones, but maybe you can already roughly estimate what we could do so exactly that. It's roughly the plan before christmas and after christmas. More so that difficult system programming over christmas there's another sheet but I'll maybe have a little bit of a look at it. But.

B

It's usual over.

A

Christmas then I wanted to accommodate you for a while briefly organizational questions, I, don't know, but I know that, but there's a website. That's often the case. Sometimes nobody hears that actually, a very famous page that is now suddenly very difficult to read. There is every every december up to december 24. There is a task or armor 25, even or two tasks better said, and there is always something like that. We such a funny story about being told against santa claus lakics and then.

B

A

Have to write a program to solve this puzzle, so you always get an algorithm explained somehow or something like that, and then you get a few small examples from the two older ones is, for example, and then the solution for these small examples is given,. But the correct input for the algorithm looks like this, a bit larger,. That means you definitely have to write a program or you have to put in a lot of effort and calculate it by hand, but I don't think you want to do that exactly so. That's just for that.

A

I can only explain that warmly. It's a lot of fun. You probably don't have enough time to calculate every day, but it's definitely a lot of fun to do a bit of it puzzle and if you ever need work here or anything else, you can also look at that and maybe solve access load. He knows so I.

B

A

That's very nice to recognize that way, earn more and then at some point, as you can see, I have now too again did nothing for the last two days, so it was a bit difficult. Then I listened to the old tasks for a moment, because there were also a few problems. Maybe.

A

So we go around calmly through the middle understand everything, because this trade history is natural, maybe new for some, and it's definitely a bit difficult to understand that to do exactly and these tasks were also quite artificial. You've given it was, of course very strong and trades very concentrated on trades and building trades and other things you will, of course, in the normal not having to write code. All the time works. We’Ll first, look at it like this and come up with a mammoth task like this we’ll program.

A

The first two functions together here and the first was that you should write this klandt method here at some point, you’ll get a and a b 1 in one in rhein-main max. I hope you all remember.

A

And with such generic stresses, when you have to think about which types or which trade builds I would like to use, it is best to write the body of the functions at the very beginning, as you can see, then which functions are used under which functionalities, and that was the first task then yes, then, you can take a look now done so much differently. I'll show you a trick for a moment. You can just loud people and then with them with the butcher a bit nicer that write it down.

A

Then you don't have such a festive feeling. It's sometimes nicer. So if somehow smaller than minimum, for example, want to.

B

A

Is bigger max if you give something back and and give back in such a way where we now assume the menu and max are correct, so less than max that 's, our prix condition for most functions, write down, so we would say.

A

Max somewhere, we don't have to assess that, because that would be a programming error of which the calling called didn't take into account. As far as we know, I hope so right and so far it is clear for the time being or.

A

Now the question is, of course, what should the directory be? You can now replace the idea of type parameters for how many parameters do.

B

A

Want that you rashly.

A

B

A

So you could we catch first of all with one you could now get the idea of comparing apples and pears. By simply saying this eco or parship food trade ix is , comparable and y or something else. But then it also happens. We go back a bit and then have to make a decision is what we give back. He has to be a guy and we would sometimes give back min and sometimes here it wouldn't make any sense, then, to use more for types.

A

So right now, and I think that's what you waited for at some point and then you thought at some point it will work and then, of course it won't work. What do you need? Fairtrade.

A

A

A

A

A

A

Work out somehow to get it right, and here is maybe a bit of a question: do we want to have drilled, password or main? If we now introduce ourselves will say something like that: the small places lamba 30 and 50 us? What would you expect, then? What would come out there or something else would be here 3,3 and we also want it in the name of 50 klemm, it's a bit of a question. What what we would wait there there there wouldn't really be a meaningful answer for this,.

A

So one would also say case could make sense to ask for a place here so that everything is really always comparable,, but I also did it in the sample solution presents a place,, but you just have to be aware of it and think about it for a moment. Go over it and then say a password what the heck and now it gets a little more difficult, and it was this on the product.

A

You somehow get in and you get in, and then you probably noticed with our tuba and now the question. What you have time for with us so first needs the body function. You can write. Super short is a specialist b and a his lines. So, but now the question is: how many parameters do the hand we have to be branded sometimes beats one.

B

For the first edition tts generic about it about.

A

B

Lgs too generic baez and then to iran, which would be illuminated.

B

B

B

B

B

B

A

B

B

A

Looks pretty good, I guess not. All of you have come up with exactly this solution.

A

Rich one is only suspected. One could still have one type of parliaments now so say that now it's a bit easier to.

A

Have a tee and at&t is also a type t.

A

And what actions do you take here on the guys that are absolutely necessary? What do you say here, now, so to speak,.

A

But somehow demands that the guys do the a and.

B

A

Of their types are, of course, that doesn't have to be the case. We can also put any other types in there too. It's a bit like this again, it's a completely artificial example. Granted in the wilderness, you'll probably find very, very few types that are multiplied and adir war at the same time, but are different.

A

I can't think of an example right now, and that would make sense, but well that was just a small example where we want to have as little as possible with us and then we'll talk briefly about cloning. We can also write copy here. Some of you have also done it and then leave out these two clowns here, but he lowers his head.

A

The types more than clown know that by now and that's why it's better if I first build small and then manually call clown, even if it's more likely here again, there are few types that are multiplying and what is missing. Wages call measuring, but well could be old and that's why expressing it in a highly generic way is clear. So far,.

A

C

A

Readers exactly.

C

A

Looks exactly like I did it that even now there's this last last one task that you want to write to an extension trade. The pool expands by a method converts the ball to its option, and in fact you just know yourself with straight with any name.

A

You call them most with text find and say is an extension trade. I want with this trade I, don't want to summarize a group of types or address them in a generalized way,. I just want to use this to add methods to other types like this and then this interaction method is generic game then implement like this straight for boule, and then we just look in their body in front of it, but handed over to belgium for protection, I think so far, quite alright, most of them. That was how it was managed.

A

There is by the way, no longer have to do it yourself. There is also a toad for.

A

A

A

Yes, exactly this july meter trade, the grandson basically does exactly that that she also did just a bit more, so that's also implemented for boule. You can also have it as an option or as a result. So that's nonsense. This trade is not taken that seriously. The author da trade writes everywhere, be so stupid. Hendriks, as far as that was implemented, would definitely have a lot of fun. When he could do this trade, then I now had a lot of unit tests. We just stated so he can be sure everything works perfectly.

A

So he has a lot of fun with this create, but you can use that I do n't, think it's as pointless as that, because that's clear,, so I really have to be quite good,, but whatever it is,, there's definitely a traceure to use, by the way,. What I wanted to show here, there 's another very interesting page may be noticed. Now there are separate documentations, for others creates like, for example, nato right now you can see if you scroll properly. It looks exactly like the standard library documentation. That is just the output from rostock.

A

That is the tool that takes the source code and creates the documentation from it in quite nicely in html. So any creator can do that too. Your trade, that's not a problem actually for it's just ahead. I hope it doesn't work now, just here in my cargo project days or buy, then there is a thing.

C

A

Came into being in there and I now it's not alright in that's kind of reported that you could now in chrome, hope you have exactly the same for your craig. You should do it from time to time and just watch how best documented. Then you can also see how euro documentation looks like html anyway. In any case, this html can easily be generated, but where is it hosted now? So? Where is the documentation located so that we can access it?

A

When I now a pulling torque world writer myself, there is a very, very interesting, a very interesting website called drs, so that's really just the url and because this website automatically generates the documentation from all craig fraser. So we can also go here to nantes, for example, search- and we are also here to find this trade and then we would have the documentation for the name here,, which might even make sense, because you can also look at it for different platforms,, which makes no difference with most trades,.

A

But this page is definitely there too highly recommended. It definitely helps to quickly find the documentation for any quaid. So I think I've said enough up to now for.

A

Now we can look at task two. If we go a little faster, don't worry.

A

We've redefined our path here and, first of all, completely generic ones defined for tea, and at this point we don't have to restrict at all, because at this point we don't use any ability of thet. That means we can use any topic. You don't notice the maturity, so various things that just make sense to them mature because I can,. I should also prove that and that's why there is this current news here: too,, which demands, but again nothing from t january can just work like that without having to have any ability,.

A

That means there are no restrictions then, but do you need for this origin method or function? We need a constraint. Origin means that we return a vector where both fields are 0 and in this case we need the ability of t to return 0. This is quite abstract.

A

Thinking that a type has the ability has 1 0 to return, object, 20, but that's exactly how this trades zero works, and then we can call zero from tt and for unix and students have to ask for neighbors, because now the 1 must also have the ability to return the neutral country.

A

With regard to multiplication like that, and then there are these two implementation and multi are also a bit more complicated, because we have two type parameters is what is in there in our current way and where it is what is in there in other ways than they implement? The addition with one other vector easters are for our way. Goalkeeper it's your turn, then it's a nice t, so the inner type also with among other things, but it has to be, we have to define the car type and then practically use it.

A

Here. We have to multiply that with your clock, so I'm building the vector of user with a directly, and there are also various trades here and it has to be clarified again.

A

That will then be able to be implemented. Are there. Any questions about how to continue?.

A

Then there are the trucks,, admittedly, a really stupid task,, but at least you can do something like that. I hope you somehow replaced that with something useful from the drink,, maybe and hearts, or something else, well,, the hunger,. So in any case,, this lasts a long time,. These bat types,, which syntax is that I created this type.

C

A

A truck builder,- this is here myself,, maybe for.

B

Weeks load, if.

A

You gave it a name, then you would quickly find out all the names that make sense say nothing in content value, somehow something like that. These names bring nothing so far. Finally, a tubist quite good, because we are really waiting for another one thing and want to pack it in a new type. Then we will implement display for this purpose.

A

If this inner t also display presents the markets by the way that I only use this sap module when I invented trades implemented, then always everywhere, fmt imaginable, you can of course, do the same now, still just copy theoretically and say that also works for the back. So if the td bank implemented I also implement the bank, a similar pattern is not that pointless by the way the thermal paper painter used and there I am exactly this pattern. Also said, then someone somehow put green paint and now another thing.

A

Yes, what is happening now is that this other things in this case a string it is had in another object that 90 was painted. So this one went is a punk method, I'll do a little line of code and it returns a painted. This painted is also a rapper object, and this painted also implements display if and only if, the device display implements now that this painted object.

A

First, has the text of the terminal set to green then sets the correct implementation of display calling an inner object and then the color of one of the text in the terminal resets. So that's not such a stupid task. That I gave you there adding the text is, of course stupid, but something like that would definitely make sense. That's not okay for nothing, because then you should with the motivation.

A

You still implement this extension trade here and here there are several possibilities. Should this be possible,. We.

A

Can call up any object on any us work and we can do that with this extension. Shady we are already used to, and we can then use counts here to always talk about what makes this implementing type possible,. It could also be done differently if we said that the trade is generic for the type and we then leave it here.

A

And then we will deny that for the skaters ex t, for the second would also work, though, is it not absolutely necessary to also specify these parameters, because you can also use self? So I think that is the better solution, otherwise make sure again that in your stand, there are about those from home looking at it.

A

That is also very important that you do something like that then, once at least understood properly, namely from the model solution so for money, then it goes on almost one thing I still have to short waves, but I somewhat imprecisely or wrongly, depending on how you said it and that to do with the other that I told you last time its so wrong. Other box was promised at cargo. It is best to enter it in the major virgin.

A

That is not quite correct, so I should have said that what made him wrong the card account with should carry a few other things that we now also have a slide and that you can specify the version number 1 cargo punct in several ways that always consists of an operator and its version number only if you don't specify an operator which we have only ever seen so far, then it corresponds to that car.

A

It this roof operator, we'll just go through it briefly, even if it's not that important, so that it's explained completely and correctly, there are these gateways. That means we want to have version v or a new compatible version. That means, if we have one to these as I said,, both of them have no operator,, which corresponds to what, if that one career still anime sante gives up the ghost, then that leads to exactly that. We can take all versions that are larger than 123, but they have to be smaller than 200 so really smaller times.

A

200 is fine, a major rule bank. That means this version that is no longer compatible with each other old version. Then there is the exact same 1 that is simply given with an equal sign here. That means I would now like to keep exactly. This version makes it clear that does n’t matter very often, I am don't know why everything should be specified, but you can definitely do it now. Turkey has. This is still a bit restricted, because the karoo can choose its version.

A

If you say something like this till de one, two three means that it can now also be new as 123 be or 123 itself, but must be less than 130, because my version did banking, transactions, I, don't know exactly what that's good for if it should be used,, so you should always just continue to use it without to use this carrot operator, so I haven't actually written it yet craig where I had to do something else. These are.

C

More things that you.

A

Rarely need have already told you briefly how you use the link above. There is more information about it.

B

A

Of course, if there are other ways and pointers, we will approach with diversion, but that.

C

A

Done or not necessary, at least there.

A

Is no question about that.

C

Let's finally,.

A

Make it a main topic of today's session or this week, and maybe next week, we'll do something like that see if we are progressing fast enough, I.e. probably not progressing fast enough, then we can.

C

A

A reading, or just as an exercise bandages here, is something of a kind next week, then we will definitely deal with this topic here, a little brett. The topic still this edition to make the mistakes I actually promised, and we will only do that before christmas. That means nobody will get through it faster. Then we will just take a little break.

A

So last time we got to know this whole track. History, short indicators. We will now take a closer look and repeat again, so the curators of the there were three trades literature to describe once a completely normal e trade. That just means like having a guy who somehow deliver an optional element. It goes through this measuring method that is formulated, very, very generically, and the definition for this is the following.

A

So we somehow have an associated associated type line that the implementing type can choose itself, and then there is a method that delivers the eventual introduction product or keeps it very general. That's why it makes so much sense, and typically it's now when name was returned means it never comes back.

A

Another element makes your appearance, so we then consider taring a list, or else some country is always returned until then country is returned at the end of the list and then of course, attachments are always returned, so typically deliver, and so almost all methods and functions are implemented that once there is a country that you can select, that is not necessarily forbidden by tradejet. You can also return a rope at some point after you have said it three times, but typically.

B

A

Assume that once took and this trend is.

B

A

Complete at the top right has a lot of the freud methods. That means methods are not defined, already, have a reputation that we can use directly. That means, as soon as we implement the seatrade for our own types and will use this lex method. We can also use this large chunk of other methods directly to document this,, which of course makes a lot of sense.. Many of these other methods are literature. Factors.

A

We would then look right after us at two other trades that have written special detectors can also be from the back.

B

A

The list, or are things that I will give you back. You can also ask for elements, I.e. say the whole text, but max beck and of course there are exactly two separate ones where you can ask the tenant and adviser about the length. The longer will know that we will have.

C

A look last time and.

A

Then there are a few. Other tracks are very important. One of them has just like last time briefly to.

B

A

Conversion from literature, collections and back, which of course makes a lot of sense, often have different types of flecks lectors. Maybe there is cunning and the child wants to use or raps and they want to turn the gates. Then maybe vice versa. Again, once there is a tui gate falls that had already met. That means you are just a guy one floor down and who knows why important for us that had a special property.

A

B

A

The loop, so it is just as important.

B

A

Us to pass before loops work. We are in implementation for this trade their last seen briefly and would be in utah reflektor and the beauty reflector that you do it again more precisely. It makes sense.

C

A

Other steaks that you look forward to the theater, and that is genetic again about that means as much as I can create from a consultant that you say mostly collections, they say there is more nitrate and I can create a new instance for you, the selection. There is also another parliament nations. You can de create a way from an adviser about tees. I don't think that's very surprising, but there are also several and element actions that you might wouldn't have guessed directly.

A

So if I have a stage about characters, then I can create a string from it. That's right. If I work in therapy with dasding, stripes or another string, then I can also create a string from it in europe. So there are a couple of sensible implementations that you can use very well on the whole strings. Of course, one after the other.

C

A

Is very related trade that you extend. That means not only as much as I can from a daycare bike tour. That means we want to create a new instance for you, but a collection take and expand content through these nitrates. The implementation is almost the same. As with woman literature, you can imagine if I somehow create a new instance, a lot of action fight from a rear wheel, then I can also expand. An existing collection be clear, and here is an example shown.

A

If we have such a vector,, then we can enter a literary place or something that intuitively orientates in such a way. That was small animal together with its quarters bar, and then it is given on this path there. All the elements of the dictator in this case contains on the vector all numbers from 0 to.

B

99 exclusive.

A

B

A

N't describe it is for it and new exclusive. Ok, now again, briefly, that the reactors are finally then order in advance. We can now about his way to repair the rectors repair about that, but that actually almost always another type medium. We will try to design it a bit more how we will write a floor vector so we have the type vector and would like to be allowed to write his act. First of all, we can't open the door for finance vector ourselves.

A

If we don't have the position of this sector at all, the current generation doesn't fulfill it. We only have this way, although the data is in there, but in order to tare it somehow remembered which positions are no matter. That means we can't just.

B

Do it clearly for.

A

Implement, but that has to create a new type, because if.

C

I just budget, there is also the city.

A

Library and this crime scene somehow removes a reference to the alarm clock and a position. What I now here it.

B

A

Balance this reference is very simplified here, because you can't just write two all along the way. Then you'll need live tiles later, but we can ignore that completely just to understand. That's what we want. In any case, we want to have a temporary type, that's only used to integrate and he just keeps a reference to this sector in order to be able to access the data and a current position and now, of course, we're happy.

C

A

That, with a theater, a cinema animal then we'll just do it like that, the management. Until then, the reference to t also ranged over references from values in the sector, not only integrate the values directly, so.

B

A

Want to implement this ex method and just have a look. We have just reached the end of the road. Then we will give back in the country. Otherwise we will look at the place of the rector. One is thinking right now. Yes, he is so that's kind of a really simple implementation. We increase our position, dance, dances, the otherwise. When we walk towards it like this, and now we can also use it to create. The star is vector that you say this budget where we say catch, we position nine patients vector reilly.

A

Do you want to take the route via the triremes and then we can say vx in day care center wing? That also.

C

A

Then we just establish about everyone about the references of all elements of the sector. Of course, I don’t want anyone to write exactly like that,, especially me. Don't always create this strange tract here and therefore look so it can be done even better, but depending on the had notice. Yes, that actually needs live times, try not to type it that won't work.

A

We go on so I've had this litas again and are already being implemented, so need a rather felicitas job implemented, and what we would like to do now has something to say as well as rector and then things, business, heart.

B

B

A

Intuitive, so how the implemented is maybe important for a reference object not for vector the traffic could then say directly. Here, too, then indicate.

C

B

A

Effects so that a leading franz would be on the way, but give a one that we can then already use this to create our rent rate via references to the content that he can also give.

B

A

The dictator that will be integrated into the literature, then we have to state what type our theater is. That is this daycare center, that is our theater for our type that we can use for. The taring then implement this intuitive method, which is mostly determined from such simple instructions and does n't, contain anything exciting anymore, and then.

B

A

Works so that one is usually done is that one implements another method for vector directly,, which he then usually budgets for,. So in the real world, it's called the factory and it gives back to the raw material like that, the theater, that is for a short method- and we will call this up intuitively on the reference in more detail.

C

A

A moment we will see the warning right, often enough say no more so.

B

A

B

Can do that without now.

A

Because this l4, that has to be a whole sector like that, we are also a bit difficult to immediately. So typically, we always have a real world. We have a spot selection. We usually have three implementations of intuit. I can even do the implementation for the in youtube de france on this spot, detailed also in youtube references of the types of the elements, interconnections.

A

Then, of course it was now for a minute again and then, with the concentration that means you consume. The whole collection is usable, also keep all the elements at value, so you can somehow consume them again, and then there.

C

Are also these.

A

Little helper functions once this budget that is for in the youtube fans are here, comes the system that we could correspond to liters, almost always one in the youtube fans of the collection, then call daycare, but of course, I never want to write. That is what drove peter muthmann that mainz to the news that corresponds to the one here.

A

If we would only call up intuitively on cd, then of course the consulate war bing would be used and not just this via interfaces, and then there are sometimes special methods to get special literature, because I already know one here, for example,. He.

A

Has one of them definitely already used ready.

A

For example, this method of string- you can so this streams performs implements intuit more intuitive, not directly. You can not just say about a strings flexitarian westermann l, which terrace I would like actually I would like about. The correct second would be there. I would like about that. The other two, for example, you.

C

Can also look at the.

A

Power of animals are rare, but sometimes- and there are other factors for separating over screenings,, for example, this other unicode, this user, passive character or something else where you can talk about it or special, maybe most interesting snap dickies method, that's a writer about the whole gravel of the battle. That means we all the values behind.

B

A

The gravel but repair about the keys about something like that. There's just keys and this method cheered you back into it. Funny types of literature implemented this type. Is we mostly don't care? We just need to know that he imports theater.

A

That's why he often sees such weird guys, who, yes, what he doesn't know what to do with now. You can now tend to the idea that, once we write something like that completely understand, how can we do that without prior grinding without prescribing there I have a short time. You actually have all the necessary information that is about exactly the same functionality for this code snippet, but we would like to come without ahead.

A

Maybe one with.

A

Points after 1 minute.

C

C

A

Ok, we collect Someone, didn't cut.

D

Suggestions quite like.

A

C

A

Already has their objection or doesn't tell everything, but first of all just about to explode real.

A

A

D

D

A

The next animation is everything so.

A

Write something else down, so what am I supposed to do over there.

B

A

That means it's definitely very important again not to give another tip give.

A

A

A

A

But that's still today is that means.

A

Tip ballet that I'll do something for a very good idea. Yes, what should you do now? You can.

C

Somehow do more.

A

C

A

Too many things at once does someone else have.

C

A

Idea what I now first of all.

A

C

A

About to do brand, for the first time.

C

A

Theater, on which you can long ago trigger a suggestion, is the last thing to write in it. Then first.

C

A

All I would like a little understood. The problem now is that intel budget is executed every time and everyone writes integration. That was once to.

B

Do unless that.

C

In turn, there is.

B

Nothing in it, you always see the element.

A

Water, that's true. Maybe if director no longer use rector opponent's, do it won't terminate.

C

A

We like to hear the intuitive call up somehow before.

A

That is my first two dates.

A

An idea what's wrong with it now could be a very small detail.

B

It could be that it 's already the initiator, although that shouldn't really be a problem in this one. There is also exactly.

A

B

Could see if there is already one, then you have to.

A

B

Nose that there.

A

Is such a nice generic interest that is intuitively, presented in an interesting way for everyone and simply gives back what you just like the functional is nature for next was that's nice says this next and a youtube wants something. That means something else.

A

We can't call next for me.

A

Then, actually everything is ready so far.

A

A

A

A

A

A

B

B

A

How you do it, then? That's really exactly the same. Constantin.

B

A

Has and so come when that still means slow use during the day, but it points to a little gimmick for us that I never really need to write it down explicitly. Of course, we always have to use the idea. We quite funny that you have reason to have.

A

As far as the actual trades and how they tractors are mainly implemented now, we would like to take a look at which helper methods in which the voith finally have their goal, because literature is extremely common in the east and allows you to write extremely compact, various things.. You have to be a little familiar with all of this variety of methods provided by the moderator, but we also start very simply,, for example, with the method count the consumed so.

B

A

Means the initiator goes through it completely and counts. That is important. Normally, you would think I can somehow determine the length without the literati not quite right to touch this count council of ministers and calls next, as often as it comes back and counts the steps. So if we have something like that, a complete 3 out, because we can call next three times- we don't get two three and four from this one with advice and that just went quickly so counted the 3. You can do that by.

B

A

But of course, it will take quite a long time to see what happens, maybe not in the hotel, but ultimately it will overflow, but it will just take a long time if you also work with a 64 bit system, but you can in any case from mischief to infinite initiators.

A

There is another method that leaves people with an optional item and it also returns the last one. There is the last line and also consumes the whole thing about that. It's nothing to do with sex called until a man comes, and then the last one that was lonely is returned,.

E

A

That is also an option, because why.

A

Is it nothing if you call.

C

A

B

A

There is also the method that you have already seen briefly. When we talked about characters devices have there, you indicate how many elements we would like to have, and here too the intersolar will be consumed until the count has been high enough again and that will then be returned,. But of course there is an option here if you don’t give the element. So summarize, a return beforehand and here, for example, are on an infinite literature that you can call up. You can just say the seventh element of.

C

A

A

Ok, I think that's clear so far. It's still quite easy, where you look at it with other methods, it was a very useful method which he often needs,, namely the collectors, for example,. What it does is that it converts one floor into a collection, that is the question,. What is the swiveling and do we need here?

A

Converting the collection,? A bottle belongs to dennis b, and nobody needs to be warned to.

A

C

E

A

So say, representatives of our implement and then you could do something like that, for example,. We can actually go to the bike tour collectively called and on the left side we want to have the vector with it,. It is important that you always have to specify a type manually. Then the other person should know that we want to have a vector is just as good in a headset toilets or in a list of links or something else that will also work,.

A

So we have to explicitly specify the path either on the left side or with the great theoretically. Here I will know about the rest of the meeting on this path. That, of course, have such a generation. Historically, he is here, I can but a turbo fish. It was also possible and in particular we don’t have to give the path of the type completely, just say: that's a factor is what's in the vectors that it's not that important, then there's the consequence.

A

There's the maximum, franz nitrate is or what do we need for this build a step.

A

D

A

Objects, how do I get the type of our objects? We can then at some point later, it's easier.

C

A

Colon, the law now still on the left side of the double pack there you want to find out the type of our objects. How can we address it?.

A

Like here is counts, colon exact comparison in this case place. We need a total order of the elements really being able to say what the biggest element is. So we can't say by the name was again: it's the biggest. The window demand as well as a total order. Here is the example of the 60.

A

Example, you can also form this sum with there. You have to then also state explicitly on the type, and if he had known that, the little guy would have known then he would not have become famous or only a little seems to.

A

Need another method here, of course again in the shakedown, but tomorrow two women will ask this funny thing. He said that could be.

A

That thing I can be transformed into literature, and now, of course, you only have to say that our item can be compared with the other riders.

A

Then we can also compare two pieces of literature with each other, so in particular is even more generally put. It didn’t even have to be a bike tour, but just something that changed. Transforming it into a theater is, of course, even more general, and here we see, for example, in vienna. We can have a rector. We can simply compare it with the metaphor here we can put the vector directly in this aequo with or because that intuitively imitates, and then we do n’t have to somehow call up.

B

The deed question 2050 are.

A

The right to speak correct, I.

B

A

Mistakes again, I only have up to 100, but exclusive 160 residents of the year came out very funny that I will definitely improve now.

A

At least one of them had the story of the little.

E

Gaus, okay is really always.

A

Such a question so typically the rule if we want to separate a list and things that the chamber and that it would like to share in several, definitely always have a trading.com at the end. So if you.

C

Also have two elements of this list so.

A

Have to do in the first and second tree that in any case, income in between normally make.

C

A

Behind it, you can.

C

See but here particularly boldly.

A

Endure this blog, which he himself is of course also write time, would have a little more space on the slides, so maybe not always take everything exactly from slides. That goes into the valley, so, typically with.

B

A

Trading.Com have.

A

Now, let's take care of it now, the helper methods are over for the time being. Now, let's take care of these internet pato raptors. These are functions that take the doors far initiator separator. This is such a rapper who rubs this old literature. There changes the functionality of next it if we see, for example, first of all, there is not this method yet, so this is now another method of trading that takes another one and judges. It's funny that a bit strange see how we can save it,.

A

You can just say we have this budget from 4 to 9 and then call take 2 on this proposal will now number two elements: long continuous right, four and five, so the first two markets in this sector. This technology was different than a generator and gives back something else. That is also in the theater and the screening of the first two elements of the original was so since.

C

This whole fuss is kept here that this whole law as well.

A

As intuit or adviser implement- and we can for this example,, the provider's calculator is also implemented, because you don't understand that immediately when you think older. This tag method now does what the tate method itself does nothing the implementation of next from this tag just now made quietly.

A

First of all this stayguest report, we are generic with more than 1 meter, bike, tour and pigs in our the original literature, and we also have to save how many elements we want to spend, because we in here now, of course, want your rate and lament for this steak.

A

Of course, only if you actually do it about and our team exactly the same management of this originality and in our next method, it now looks like it says, nsn how many people would like to publish if that wouldn't then it can go back to the former organizer of the vain. If that's.

C

B

A

Then give back and don't touch the.

B

Original anymore, the advisors.

A

So the magic actually happens in this art lex implementation. The implementation of this tate method is nothing else to do except initialize. This traction to give back will just stand in it big confess estate, with the self a colon in wrap up.

C

D

Or the larger number.

A

Why, or why not.

D

A

Text noticed back so that can.

C

A

Around my ears, such literature.

C

B

A

To a certain extent, you can also implement most of them quite easily yourself. It doesn’t have much code. You will notice that this relief fund policy are simply super. Super sensible will be to the contract. We always.

C

A

Think that another type will come back, such as this capitalized type for again implemented floor. You see a lot of such types in the literature modules from the standard level, all quite funny and plentiful interested in whether you are not at all interested in us only that they also implement floors. So we.

B

A

B

A

Look at this computer documentation at all,, but rather we and only.

B

A

Method, tag on and there are still skip ends which skips the first elements. Various the call out there are two say get by then for numbers from the town hall are planned. Two.

B

A

Exactly right, better still secured in spring, there will definitely be a very simple help method. Then there is it that makes a lot of sense. If you ever ask yourself how can I repair my path now, but anyway, once got the index to each element. That's exactly what this method does welcome this day.

C

Sun made hacked.

A

Characters in question, and just as if the slides fit then I'll talk to that gate temporarily. Otherwise, I'd just be that expert write in often either on then on that at the moment in emmerich, of course, now gives back mine originality, but at the same time, high with wedding and this interview, he reveals that as a team of items and opel gives back what was index and character. That means we will each new a1, b and 2c as reacting elements get that perhaps also makes sense. Sometimes, of course, all these factors can be combined.

A

This capitalized tag, for example, there is now a floor again. That means we can call up further methods. Then.

C

Who? So, for example, that we have to.

A

Ask what comes out rear wheel.

A

B

A

Combine with each other also, of course, that in the raid against all of this tractor, there is of course more here just a little bit by one time that the consultant repeats forever, when he say say 1 to 4, and then cycle call sounded and just as a value, 1, 2323 and so on. The signature of this method is the following, and the checkpoint is that even the deed he attacks, the clown must be bar, I.e. this cycle implementation. He must eventually lead the.

C

A

Out again and again, otherwise, you don't have a chance, because you ca n't always start again. It can't do it of its own accord. There is a hit that turns a writer if you also call this on it 321 what I find exciting about it, but.

C

A

Course very useful with various situations, and here can be again a bit of a puzzle. What kind of statement I have here that is, but I then have a sign bound on it. Well, I.

A

Said more at the very beginning,.

B

Maybe you have to be suitably trained, does not mean that implemented. I would say, have a look with.

C

B

In a projection, first rhein you sort of give it okay.

A

B

A

C

Third, in the table.

A

Date, but exactly that the right solution, if we can call up nextbike, then we can turn it up by the way implemented. So you could press back this funny thing. It's another type of budget financed in the end, also because a dita nato.

B

Certainty is different from literature, a lonely one would me exactly like that.

A

From here one speaks of pr sometimes, but is a great family and gentlemen right, but that's a few wrong ones watch out, so the terrace implements everyone. If implemented. It also double ends expected that does n't necessarily have to be implemented via my terrace. You have to put an end to the depreciation, but is that possible.

A

Imagine the implementation of iittala from the rest.

A

So that's kinda got me a bit, but here it is just an original advice.

A

What is here now, but.

D

A

Can call up nextbike for my type in the rest sensibly implement.

A

It is also about as much reason the julius pathogen adapts open is benefited up to 22, frank.

A

A

A

A

It to the max page or.

A

Turned off so that means.

C

In the implementation of.

A

These two methods by one of next next around so.

C

Yes, this meeting implemented.

A

In the long run ends the theater so even further there is still worth walking the terrace about.

B

References in a.

A

Writer about the real evaluation of his vector and have we don't raise points dieter remind us, there's a fuss about english words, references about this sector? That means it's for the developers to give back 12 parts, and we can now say it's worth it. Then every element in it will be cloned once and then that at value Yes, of.

A

Course,, it works very simply here, because the values are for the hobby,, but there were also only claw types for others and if you want to understand it, even more, as I said, well by simple or just think about how you want to implement the Whole presentation that you are quite short legally, so you can, if you want to have fun or, as I said, would like to understand it. Better I can take a look at one of these trade sites and it is also only the first part of the tractors.

A

There are more to come. There are more champion who hangs two goals in a row. That's now two perpetrators were so if I say that what will the resulting budget pay for return.

A

Not necessary the definition of analysts again should the other part has to be an interest of his.

D

Just has to be.

A

Something that can irritate me and with the recording additional build that I say here. What the everyday life of this stage will come out must correspond to my other ones. So the two old types is the same. In the view, there are still the stalemate, two tractors and always spits out both elements at the same time so always takes from both gates at the same length dementer. So if.

B

We arrive 7.

A

To 10, together with dmc, because the couple wants to get out again next to it, both elements were always mixed by baywa troops. Of course, the question arises: what happens and a bike ride longer than the other just belongs too. If the the shortest theater is finished, and that.

C

D

The definition.

A

Here, again,, you show us this whole definition of trade, because that is what is mainly done and practiced. Here is less of writing trade brand yourself than that you would have to understand them for other functions, very useful, difficult to understand with other function and not just the parameters of the transfer.

A

Ok, now 15 minutes and we'll first listen to the interactive ones, because all other helper functions and consultants doctors need another feature which these cloisters and we will only look at two utilization levels that don't yet concern themselves with club bosses,, but first with other things,. But you can think a little bit about it, and you can save the function as variables,, which is.

C

A

That is typically a new concept for many in particular, who only programs java what computer scientists? Let's imagine we have the following two functions, quite simply so their function that lets take a sphinx and output, something nothing special. But now the game is a bit special. Is that we want this here. We want somehow dependent.

C

Was in a strange variable that can.

A

Take on two values: select one.

C

A

The two functions- and these are really used in the larvae of the function without behind the classes, write the names and the journey like just a variable to that is in this variable. Greta. One of the two functions is stored in it. Now we can use this variable as if functions were life-wanting to train our programs for days, but.

B

Rita seitz.

A

Any functional thing is also called a funk gate, a funk that a functional thing, something that you can call up I think that's definitely a bit of a white feather.. Who of you has never seen it in this way that you somehow save functions. Variables come okay, no vehicles going on people. That's a bit strange and.

B

Actually, it's.

A

Actually, in many languages at times just look at it so.

C

Far, first, that.

A

And something really.

B

To message when.

A

This skill we either light or usa, always said to the second, and now it comes to thinking. Rhein is pretty good to be able to do that. So first.

C

Of all these things, we.

A

Are doing here, specify helau, alaaf and rita are so- called function spent a the functions are also somewhere in memory, so they have an address and behind it is that machines coach. That means today we can just say, jump to this address and then the computer starts. What comes next, as machines briefly interpret.

A

That, of course, what can be stored in a variable and that especially educators that we can pass on the behavior or an algorithm. That means we can store a function in a variable. That means there is an algorithm inside we can pass on. That is very powerful, For example,. We would now like to write a function that greets all party guests with a passed greeting function,, which means we get some criteria here. That has a weird type, and then we can greet all of these knight users again,, so that replaces its function.

A

Center type, again,, no worries you do, n't necessarily need it. Very often, you will see the following opinions later. It doesn't matter that in any case, first of all, the type of this functional panther and now we can just call this function orchestra and give different functions, what the channel association and then that will be output that you mute. That means we give an algorithm in this case a stupid algorithm, duck new. Something goes out also internally, but keeps a behavior.

A

We give another piece of code whereby the other piece of cake can decide what it wants to do with this algorithm. That means now libraries can building a framework for any algorithm.

A

If everyone looks at it,, you usually have a framework of kot and library coach. That looks something like this,, I.e. I write the mail function and I now call other functions of mine,, but at some point these functions can have a library function on.

C

A

Downloading a website or copying a file or anything else, I'm so sorry to get a function, but.

B

Underneath it will.

A

Never be green again, so underneath it, the people just call out their function again. They don't really know me. The people existed before I wrote my application. That's how it typically looks, but it's very limited that with such a pattern, we can just call our code from the series. Again we can unfortunately say a piece of our coach didn't result in anything say, do something with it library which then open these snippets live again. That.

B

A

Very powerful pattern was only briefly as a comparison. This interface or anne wants that you have, I think, dvp. We probably did that in most areas in the context of trends got to know, there is somehow but leads start method or something like that. Yeah man, Of course,, you have to hand over this method to what is to be started on this other sword.

A

You can hand over the world because one year was very, very limited.

A

Sorting with comparators a list of something you want to sort me one, but people who don't necessarily there with their built-in sorting methods or, for example,, with the compatible implementation of this part, but calculate using comparators. We do that now, with these comparators tvi, an algorithm code. That means, since I, gave the sorting function a compact one.

A

This is your function that has the logic for merck's place or something else trend that we do n't want to write ourselves what he probably wants to write to the curator, who simply calls the sorting function from this merger, so.

B

That we can compare.

A

Students, for example,, after their matriculation number or other years,. Of course we will let these comparators do it again by giving the objects rhein that give certain methods in the plenum before the interfaces ultimately implement something similar later, but we will see that, but that is it actually everything I convey now. First further, we can in this case with function programs we see, but there wednesday, about this works even better, a library subordinate our algorithm.

A

That is in any case, on pattern that we will see very often that he does that very much is often used,, which is also.

C

A

Other languages, by the way, so far let bloggers because there is also lamb,. That is because they also correspond more to cloisters in java 8,. There is also lame that, however,. They can once again be much weaker than the country's cash register get to know everyone, but that's something very, very interesting. You honestly info b and info, not what you that.

C

Time we have to.

A

Go head and then we'll see each other on wednesday.