For Loops

For loops are a great way to run code a certain or changing amount of ways in a concise manner. For example, here is a for loop that prints all of the numbers 0-9

for (i in range(0, 10, 1)) {
  // range takes in a lower bound (inclusive), and upper bound (exclusive), and a step size are returns an int array
  print(i)
} // This will print 0 - 9

This is not all that the for loop can do. As you saw, the for loop above used the range function, which is an internal function that takes in a lower bound, upper bound, and a step parameter and it will return a list with numbers from the lower bound (inclusive) and the upper bound (exclusive) with differences of the step variable like so:

range(0, 10, 1) // [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
range(0, 10, 2) // [0, 2, 4, 6, 8]

This is used in the for loop example as the for loop iterates through each item in the list, setting i to the next item in the list before each cycle, allowing for usage of the for loop like so:

for (i in ['this', 'is', 'a', 'test']) {
  print(i)
}

This ends up outputting

this
is
a
test

This is not only limited to list literals as we have seen, making it a useful feature to read every item in a list.

Notes:

• Currently, the only iterables that are registered are list values