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Hi, everybody, today will continue discussing for loops we were going to step it up a notch and see

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some more examples in the last lecture we have seen for loops combined with lists.

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And today we're going to see how can we use for loops combined with statements and also with a new action

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called Break.

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So before we begin, let's see a quick sketch of the flow of code.

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And right after, we'll see many, many examples.

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So, for example, you have a list with several items inside and you want to find which of these numeric

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items is bigger than five.

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So just for example.

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Yeah, it's just a theoretical example.

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So each time will we will check if the cell is bigger than five.

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All right.

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And once we find the correct value, once our requirements will be satisfied, we want to quit running

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iterations upon the loop.

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All right.

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So this is the case.

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So let's see.

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Let's see here and the sketch on the right.

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First we initialize the module, we run the code and we tackle the loop.

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And right after we extract the value out of the list in our case and we compare it, if it's bigger

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than five right after we were seeing and if statement.

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All right.

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And inside the statement, there are two options, whether the output of the if statement is either

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boolean true or boolean false.

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So we want some requirement to be fulfilled in this case, X bigger than five.

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And we can see here in the sketch that we have an error that goes to the left.

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For example, we have the first cell equals to one.

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So obviously it's not bigger than five.

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So it's a false.

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What are we doing next?

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We continue to next iteration, meaning we're taking the next cell out of the list and running again

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the loop in second iteration there.

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Obviously we encountered that statement once once again.

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And we're doing this again and again and again until we will see that our cell is actually true.

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Our output of the if condition is true.

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For example, we have the number ten, which is bigger than five.

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So it's true.

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And then we want the code inside if a block will run.

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All right.

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So many we don't want any more iterations.

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We found the item that we're looking for.

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We're looking for the first item, which is bigger than five.

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And then we use the action key break.

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And that key, that action key basically tells the loop, stop running.

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I found what I want.

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All right.

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So from here, let's see.

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Many you see here, many examples that we're going to learn in this lecture and by these examples and

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by this sketch together, I think we're going to get the hang of for loops combined with if statements

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are also actually what is the break.

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All right.

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By the way, just a quick reminder, this lecture and basically all other lectures as well, have an

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attachment file, that PDF file that you can download and we view after you watch the video.

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All right.

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So first of all, let's see how loop is applied on a collection right on the list.

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So once using a loop upon list or any other type of collection, each iteration would scan one cell

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in the collection.

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We already seen this in the previous lecture as well.

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So and if conditions statement will be used for some actions will be used for some actions to happen.

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So in example, a right here we can see a list of fruits.

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We have banana, orange and cherry.

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And right after we are seeing a for loop, we're seeing here for fruit item.

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And if you recall from previous lecture, we discussed that whatever comes after the four is a single

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item out of the whole package and the whole package comes after in.

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So fruits is the list.

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It has to be the same name.

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And what comes after the four is the single item.

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You can name it anything you want.

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You can choose whatever name you want.

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And in our case, each each of these items will be one cell out of the list.

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And we want just to print out each iteration, one item, one cell item value once we go again and again.

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And the output obviously going to be banana or and.

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We want to print all of the values in example A all right, and here an explanation.

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One last item will be printed on each iteration.

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So each time we go in the circle again and again and again, each time one item will be printed.

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All right.

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Until we'll finish the whole list and then we're going to go and continue the flow of code.

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So from here, let's see example be and we'll see something a bit different.

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So right here, we have also the same list.

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All of these examples have, by the way, they have the same list.

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And here we also have four fruit like them in fruits.

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And here we want to find something we we inserted here and each statement.

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And we think here, if fruit item equals orange, then fruit print the fruit item.

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And basically what would happen here is that it's going to run on all of these cells.

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And once it gets to orange, it will print it out.

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As you can see right here, it will print the orange.

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But once we find orange, it's not going to stop again.

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The loop is not going to stop running.

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It will run all all over the cells until we finish the last cell.

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And only after that it will exit the for loop because we haven't set any condition to exit the loop

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once we find what we want.

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So the output will be orange, this cell.

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But after we pass this cell, the the for loop also will scan this cell.

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All right.

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And if there were more, much more many cells after it, it would scan each and every one of them.

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So only once the loop will get to the to the item orange, it will print it after orange item.

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The loop will keep running until the last item without printing anything.

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And from here, we'll go straight ahead, for example, see and here we will use the break action,

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which should be with a small letter like this.

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And also this part is the same as we have seen.

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And also right here, it's also the same.

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All of these four lines are the same.

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But here we have an additional action key.

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We have the break word here.

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And basically what's going to happen, the output will be the same because we only have one orange here.

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All right.

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But once we find once we find the orange, the loop will not continue to this cell to the cherry.

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It will not continue.

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It will exit the loop completely and go further with the call with whatever comes after this for loop.

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All right, so only once the loop will get to the item orange, it will print, it will print it.

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Once Orange will be printed, the loop will stop running because we use the break word.

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All right, Prezi.

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So the break word basically tells the loop.

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All right.

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You found what you want.

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Stop.

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And that happens because the break it appears under the if in Hiroki, it appears under the if so whatever

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runs after the if it goes by the order from top to bottom.

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So we print the orange and then we break the loop.

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All right.

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Let's start here, the typical example here, we have seen an example upon a collection, but now let's

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see what happens if we do the same thing upon a string, upon a variable.

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All right.

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So we have examples here and we have fruits.

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And inside fruits, we have only one item, a banana.

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All right, and in this case, sorry, in this case, you will see here also in fruits.

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This is the whole package.

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Right.

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And whatever comes after the four in our case, it's fruit character is a single item.

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So if our whole package is a string, meaning a bunch of letters, so a single item would be one letter

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because the whole is a word and single item out of the word is just the letter.

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So you can see what happens here.

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It's like a dynamic structure.

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If you have many items, as you can see here, each item is once a one word.

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But in this case, we have only one word here, so we will see here, we will see here that each each

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item, whatever comes after four is a single character.

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All right.

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Let me just correct you a small mistake.

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I didn't mean it to be inside a list, so I'm just going to remove the square brackets because there's

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no point for this example, if it's inside a list.

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So we have just a simple string variable here.

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All right.

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So from here, we just going to go over the call again, so for fruit, character and fruits, and we

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want to print each character one by one.

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So if we print each each of these letters one by one, we going to end up with banana eventually.

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So each letter fruit character will be printed on each iteration of the loop.

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So the first iteration will print be the second iteration will print a then in the iteration after N

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and then A then and and then A until we'll get to the last item here, which is a and then the code

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will exit the loop.

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Pretty simple.

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All right.

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So in this case we have one word with which is the whole and a single item out of the hole is obviously

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one character.

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So each each iteration in the gold will extract one letter, one character out of this string variable,

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an example.

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B, we can see something a bit different.

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So here we are going to use an if statement, same as we did on collections, a list in the example

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right here in the examples right here in B, and we're going to use the if statement right here and

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we're going to say here, if fruit character equals and then print the fruit character.

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All right.

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So we're going to first iteration go B would not be printed, then A also would not be printed.

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And then we're going to get to N and and is what we're looking for inside the IFES, obviously, and

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will be printed.

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But after we print this and the for loop will continue running because we haven't said it, we haven't

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said to it to quit.

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So it's going to keep running to this cell, to this it's not a cell to the next character, a will

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not printed then out again.

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It's going to get to and here this and it will be also printed and then it's going to go to the last

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character A and only after will exit the loop.

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So eventually the output will be and because we're looking for an and every time will encounter and

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and here it will be printed out.

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All right.

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So in total, two end characters will be printed.

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And in the last example, we'll see exactly what we have seen right here, but we're going to use a

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break action as well to stop the loop whenever we want to do it right.

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We're under control here.

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So, again, we're going to look for the and character and we're going to print it.

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But this time, if fruit character equals and we're going to print the NT and right after we're going

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to break the loop.

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So it goes first iteration here.

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Second iteration.

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Third iteration, and once we encounter the NT character, we're going to print it and break the loop.

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OK, so in other words, all of these items right here would not be scanned at all.

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The code will exit the full loop once we encountered the first and.

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All right.

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So right here, the output is then, obviously, and only only once the loop will get to the first string

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and it will print it after the first and variable, the loop will stop running.

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All right.

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So this is the example once we apply the for loop upon a variable and we also use the break.

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So summing up what we have started right here in this lecture, we have studied how how can we use these

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three items, these three topics all together?

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And you can see that each of them has its own features.

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And once combined, its like it gives us a lot of power of filtering cells or filtering letters however

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we want, and basically gives us a lot of power once we build project development projects because it's

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very useful to filter items or filter information that way.

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And I think it's very, very useful in lots of various positions in the industry.

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Whether you're a web developer or whether you are an information developer, it doesn't matter front

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and back end.

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And basically it's very, very useful and it's really important to know this.

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All right.

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So this will be the conclusion for this version, for this lecture.

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And I will see you in the next one.

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Thank you.