Name: Looping - Go Lang Practical Programming Tutorial p.12
Uploaded: 2020-03-31T18:10:53.000Z
Duration: 11 min 40 s
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Everybody Welcome to Port 12 of the go language programming tutorial Siri's in his video are really talking about is a looping in Goa.

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So it turns out, go much like it does have classes, actually doesn't have a wow loop.

But if this isn't your first programming language, you're probably very much aware that you could write either loop in the other.

You know, you could write four loops and wild loops, and also you could have a wild loop that acts like a four loop and so on.

But even like your most basic for loop example is really a while loop.

So, for example, let's say you've got your basic four loop, which would be like four I coul equals zero.

So we're initializing I and I don't really think I've stressed it even up to this point.

But when you like well, when you do find a variable for the very first time, your initializing that variable so you do colon equals.

But later, if you wanted to re assign a value toe, I you would just need it and equals.

You wouldn't have to reassign, Just for the record anyway, for I, colon zero I less than 10.

This is like, Okay, I is currently equal to zero.

And then you could say something like format dot print line.

So let's go ahead and run that real quick.

Go to dot Go and you get, you know, basically zero.

So, um, so that just kind of prints out all the values that just your you know, your hello world for loop example.

But there's quite a few things that you can do from here.

So, for example, not all these things need to be included in your four loop.

So this would be a typical con elect counter loop.

Um, but most of the time, you're probably not writing four loops that look like this.

And that's kind of my problem with, especially with language like go on, Lee talking about the basics because, um, your private writing four loops like this.

So, for example, you'll probably have a variable that's already defined.

S O he would really pry have already initialized I to be something or to be the result of some function.

And then you're gonna probably rather than incremental.

Probably through I most of the time you're going to be iterating like, Wait, what we have is a list of not a list, a slice of you or else, right?

We wantto iterated through that we don't really necessarily want to do, because again, this is more like a wild loop while I is less than 10.

Now, if we don't do anything eyes not incriminating, I would wind up.

You know, this would be an infinite loop, for example.

Um, So what we'll do is I plus plus, so that's gonna go ahead and increment.

I bought one by one basically for us so we can run that again.

So just for the record, you could do plus plus, or you could say plus equals one that would do the exact same thing The benefit of plus equals is that you could do something else like you could do.

And then it's 05 done because it got to 10 before.

Okay, So, uh, then you have, like, you could do I I know I mentioned an infinite loop, but if you wanted an influence in it in finite loop, uh, you could just do it this way.

Okay, so there's just no conditions, right?

You could just start the four loop, and it will just go forever.

So the other thing is like, let's show some more examples of loops that arm or closely matched to reality.

So maybe you'll have ex colony cools, um, five.

And then maybe you would have a four loop.

That's gonna like So, for example, like a lot of times you're gonna do something while something is the case.

But that something is outside of the loop sometimes.

So, for example, let's just do like an infinite four loop, which is just gonna mimic our wild for us.

Whatever X is, let's say explicit equals three.

And then let's say if X is greater than 25 trying to use it on there, um, break.

And so a break is a way to get out of whatever loop you are in there so would only break you out of that loop.

So if if you have, like, nested bloops, it's only gonna break you out of that specific loop that urine.

So anyways, let's go ahead and pull this up.

So do some 58 11 and so on all the way to 25 then it broke.

So at least in this case, X is somewhat outside of this, um, of this.

So another way that you could have written this, though, obviously is let me to here, so you could have just had X colon equals five ex less than 25 x plus equals three format 0.3 line do stuff X, and that should give us the exact same result.

But even though, yeah, that's gonna give us the same results.

Chances are you're not gonna write loops that look like that.

So another example is like, you know, you wouldn't have all these values and checks.

Like, for example, like, what if we had a colon equals 34 X colon equals five.

Okay, Well, while a is less than 25 um, X plus X plus equals three.

And then, you know, for matt dot print line stuffed with X and then also a plus for something like that.

So you could have, um, multiple variables that are coming into play here.

You're doing something to something else, and then, obviously, um, implementing the thing that's basically that Wow, I'll check that you're you're doing.

Anyway, we could run over a ton of four loop examples, but I think the best thing to do is to apply it to like a real a real problem that you're having.

So what I'm gonna go into is just copy and paste the XML code that we had up to this point because again, this is going to be much more realistic, especially when you're trying to generate over a data structure that you created, which is gonna be comin.

So, uh, in this case, um, we're basically pulling that XML data.

And in fact, let's just run it really quickly just to see what we're returning.

It just visits the XML and pulls the Earl data and populates a slice with that data.

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Looping - Go Lang Practical Programming Tutorial p.12

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