Swift - Loops

There may be a situation when you need to execute a block of code several number of times. In general, statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on.

Programming languages provide various control structures that allow for more complicated execution paths.

A loop statement allows us to execute a statement or group of statements multiple times. Following is the general from of a loop statement in most of the programming languages −


Swift 4 programming language provides the following kinds of loop to handle looping requirements. Click the following links to check their detail.

Sr.No Loop Type & Description
1 for-in

This loop performs a set of statements for each item in a range, sequence, collection, or progression.

2 while loop

Repeats a statement or group of statements while a given condition is true. It tests the condition before executing the loop body.

3 repeat...while loop

Like a while statement, except that it tests the condition at the end of the loop body.

Loop Control Statements

Loop control statements change execution from its normal sequence. When execution leaves a scope, all automatic objects that were created in that scope are destroyed.

Swift 4 supports the following control statements. Click the following links to check their detail.

Sr.No Control Statement & Description
1 continue statement

This statement tells a loop to stop what it is doing and start again at the beginning of the next iteration through the loop.

2 break statement

Terminates the loop statement and transfers execution to the statement immediately following the loop.

3 fallthrough statement

The fallthrough statement simulates the behavior of Swift 4 switch to C-style switch.