Swift Array removeAll()

In this tutorial, we will learn about the Swift Array removeAll() method with the help of examples.

The removeAll() method removes all the elements from the array based on a given condition.


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)


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" })


["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.

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