92 for loop examples in JS - JavaScript Tutorial 2018

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92 for loop examples in Javascript - JavaScript for Beginners.

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Hi and welcome back.

We have started looking at the ‘for’ loop.

So let me remove this.

And what I want to show you is that you can remove this from here.

And if you remove it from here, make sure you have this.

Make sure you have this spacing and you have that.

Otherwise you’re going to get an error.

So you can declare that up there.

And if you declare it up there and you run, everything still runs as we expect.

So, what if we remove this one and we try to run it? We’re going to receive a bunch of errors, ok.

So even if you do, you have declared it up there, make sure that you have this here to avoid syntax errors.

So if you run it, that should run fine.

We know how it goes.

All the way up to 5.

And then, even this will sometimes, will not be there.

Maybe you don’t want to put a condition.

You can leave the condition out.

And even this, let’s say we remove it from there and we put it here.

So essentially, this is going to run to infinity.

Let’s say we try to run this.

Let’s run it.

This will just continue running.

You see, it will just continue running to infinity because you don’t have a condition.

But you can use something like an ‘if’ condition.

If, maybe you want to break out of it.

If, or let’s say x becomes greater, becomes greater than 6.

Then, let’s put all of this, let’s put it here above, if(x less than 6) then break.

We are going to look at the break statement later on.

So if x becomes greater than 6, break.

So if I run this, let’s see, ok.

We still have a loop here, if(x less than 6) break.

So that didn’t work.

But what I can do, let me just copy this.

And then, if I close Firefox and open it again and then I paste in.

So I’ve lost the code.

But what we were doing was var x=1; and then we had a ‘for’ loop, we had an empty ‘for’ loop and then we had alert(x), x++ and then we had if the value of ‘x’ becomes greater than 6, break out of the loop.

So if you run, so you see it breaks out.

So that’s what I wanted to demonstrate, that even if you have it empty, you can have a way of breaking out of it using an if statement.

But in most cases, you’re going to find yourself using it in this manner.

And the condition will be inside there.

So this is how in most cases you’ll find it used.

So in the next example, we’re going to see how we can list the elements the elements of an array using a 'for' loop.

So if we have an array up here, maybe ‘var people=’ and you remember the array.

This is the array that we call, this kind of an array is an array that we call a literal array.

So if you don’t remember this, just go back to the section on literals and watch literal arrays.

So we are going to do a ‘for’ loop of how you can access elements within this array.

So I’ll see you in the next video.

And if you have any questions, feel very free to let me know.

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