Swift Array allSatisfy()

allSatisfy() Syntax

The syntax of the allSatisfy() method is:

array.allSatisfy(condition)

Here, array is an object of the Array class.

allSatisfy() Parameters

The allSatisfy() method can take one parameter:

• condition - a closure that accepts a condition and returns a Bool value.

allSatisfy() Return Value

The allSatisfy() method returns

• true - if all the elements satisfy the given condition
• false - if any one of the elements doesn't satisfy the given condition

Example 1: Swift Array allSatisfy()

Output

true

In the above program, notice the closure definition,

{ $0.hasPrefix("S") }

This is a short-hand closure that checks whether all the elements in the array have the prefix "S" or not.

$0 is the shortcut to mean the first parameter passed into the closure.

The closure returns a Bool value depending upon the condition. Since each element in the languages array starts with "S", the method returns true.

Example 2: Check If All Elements Are Even Numbers Or Not

Output

false