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Welcome back and this video we are going to check out for loops, and they are used to iterate through

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rangers' arrays, collections or anything that provides an iterator.

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And you will learn about iterators, arrays, ranges and collections in the future.

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Lecture's so no worries there.

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But basically, it's just a set of values that are stored in one construct or in one type of data type.

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All right.

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As we've seen, there are multiple different data types such as and double strings and so forth.

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But there are also data types which can store many values at once, and there are types of collections

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or iterators.

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All right.

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So what we can do is create four loops as well in Scotland.

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And a for loop is also very similar to a wire loop.

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So we can just go ahead and use the four keyword and then num in one dot, dot 10 and execute some code.

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And I'm just going to execute actually execute it in one line, just going to say print num in a string.

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All right.

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So this for loop here, which we have in three lines, so to say is the same thing as our wire loop

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that we had here where we needed to create a variable.

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Then we had the condition, then we did the execution of something or write something on the screen,

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and then we needed to take care of the condition at one point not being met anymore.

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And that's it.

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All right.

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But now we sum everything up so it's a lot shorter.

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So here it just says for the number, which is in this range of one to 10, please execute the code

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in the block.

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And in our case, we just do something simple.

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We just say, OK, print the number that you're currently looking at.

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So if we run this, we can see that it's just prints one, two, three, four and so forth up to the

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point where it's 10.

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So what, the value is 10.

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All right.

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So this is just one way of writing a follow up.

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There are other ways as well.

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You can also, instead of saying dumb in and so you can say I in one until 10.

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So that will pretty much give us the same result where we, for example, just print I and I'm going

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to add an empty space here.

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Let's run this.

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And we can see that it printed the one, two, three, four, four and so forth from before from this

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photo, and then we have this one empty space to empty space and so forth from this photo.

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So here we just used this until keyword.

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I would just say I want to have I in a range.

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So this here is a range which says start at one and go up until 10.

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Now it goes the other way around as well.

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You've seen the keyword down too.

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So please now go ahead and try to build a for loop, which goes from 10 down to one.

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OK, I hope you tried it because we just used this key word already, so I thought would be a great

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idea to use it in here is a little challenge.

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So for I in 10 down to one.

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All right.

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And I'm just going to say that there should be a line in between so that we see that this is a down

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to approach here that we had.

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And that we are ten, nine, eight and so forth.

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So what can you do if you want to have steps of not one, but let's say steps of two?

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Well, you can simply add the keyword step in here and then say how big the steps should be.

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So down to one with the steps of two who run this, then we will see ten, eight, six, four, two

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and nothing else.

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That's it.

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So there is another way of writing this, what we have here.

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So this down to approach and the general four to four loops.

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So this is pretty much the same as doing the following as if we had this line here.

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Dot step two, OK.

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So either you write the of like this or you can also write the for loop like that where we just use

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this slightly different approach.

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All right.

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But you can of course, do the same thing for our other four loops up there as well.

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So for the second one, we we said I in one until ten, we can also say four.

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I in one dot until ten.

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Internally, the same thing will happen already.

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So these are some examples, hopefully we're going to use them extensively, especially as soon as we

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have collections, lists, arrays and all those kind of cool type of collections.

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So see you in the next video.