Swift for-in Loop

Swift Loops

The Swift for-in loop is used to iterate over all elements in a collection, such as a range of numbers, elements in an array, or characters in a string.

Syntax

The syntax for the Swift for-in loop is as follows:

for index in var {
   loop body
}

Flowchart:

Example 1

import Cocoa

for index in 1...5 {
    print("\(index) times 5 is: \(index * 5)")
}

The element used for iteration in this example is a range of numbers from 1 to 5, represented by the closed range operator (...).

The output of the above program is:

1 times 5 is: 5
2 times 5 is: 10
3 times 5 is: 15
4 times 5 is: 20
5 times 5 is: 25

Example 2

import Cocoa

var someInts:[Int] = [10, 20, 30]

for index in someInts {
   print("The value of index is \(index)")
}

The output of the above program is:

The value of index is 10
The value of index is 20
The value of index is 30

Swift Loops