loops Getting started with loops

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This section provides an overview of what loops is, and why a developer might want to use it.

It should also mention any large subjects within loops, and link out to the related topics. Since the Documentation for loops is new, you may need to create initial versions of those related topics.

Types of loops

A loop is a control flow structure to definitely or indefinitely run a set of statement written only once in code, until a certain condition is met or the process is terminated.

Condition loops

These loops are repeated based on the state of their conditions.

For loops

For loops are usually run upon a variable as the subject of iteration. For example, for loops can be run upon an integer to limit the number of times the loop should be run, or upon an array to iterate over it.

While loops

While loops is the most basic type of condition loop that keeps running until its condition is changed (or until a break statement is executed).


A variant of while loops is the do... while loop. It is the same as while loops, except that the content of the loop is run once before checking the condition.

Another variant is the until /do... until loops, which does the same as their counterparts in while except that they check the condition in the opposite way -- while loops run until the condition is false, and until loops run until the condition is true.

Collection loops

These loops are repeated by iterating upon collections, such as arrays or iterables.

Foreach loops

A forEach loop runs on a collection by executing the code once per item in collection, giving the value and/or the key of the item as parameter.

Goto loops

goto loops are a set of statement between a label and a goto statement.

Recursive loops

In functional programming, recursive loops can be used to run a function recursively until a condition is met. This is a common cause for stack overflow errors.

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