Swift Array removeAll()

var numbers = [2,4,6,8]

// remove all elements 
numbers.removeAll()

print(numbers)

// Output: []

removeAll() Syntax

The syntax of the removeAll() method is:

array.removeAll(where: condition)

Here, array is an object of the Array class.

removeAll() Parameters

The removeAll() method can take one parameter:

• condition (optional) - a closure which accepts a condition and returns a bool value. If the condition is true, the specified element is removed from array.

removeAll() Return Value

The removeAll() method doesn't return any value. It only removes elements from the array.

Example 1: Swift removeAll()

var languages = ["Swift","Java","C"]
print("Programming Languages:", languages)

// removing all elements from array
languages.removeAll()

print("Array after removeAll:", languages)

Output

Programming Languages: ["Swift", "Java", "C"]
Array after removeAll: []

Example 2: Using removeAll() with where Clause

var languages = ["Swift", "C", "Objective-C"]

// remove "Objective-C" from languages
languages.removeAll(where: { $0 == "Objective-C" })

print(languages)

Output

["Swift", "C"]

In the above example, we have defined the closure {$0 == "Objective-C"} to remove "Objective-C" from the array.

$0 is the shortcut to mean that the first element of the languages array is passed into the closure.