Iteration with the for loop

Learn how to iterate variables using the for loop.


Now that we have covered two of the three fundamental pillars that programming rests upon, sequence and selection, it’s time to tackle the last one, iteration.

The first type of iteration we’ll look at is the for loop. This is a kind of loop where we, in one way or the other, know how many times we want to repeat something. This can be a fixed number of times, such as iterating over a list using the days of the week, which we know is always 7. It can also be that we have values in an array. We might not know precisely how many items there are in the array at any given time; however, as we’ll see, there are ways to ask the array how many objects it’s currently holding.

When using a for loop, we’ll work with a variable that keeps track of how many times we’ve iterated. We can decide what value this variable should start on. It is this variable that helps us to know when to stop iterating. Let’s take a look at an example:

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