Instance MethodSwift

prefix(_:)

Returns a subsequence, up to the specified maximum length, containing the initial elements of the collection.

func prefix(_ maxLength: Int) -> Self.SubSequence

Parameters

maxlength

The maximum number of elements to return. maxLength must be greater than or equal to zero.

Returns

A subsequence starting at the beginning of this collection with at most maxLength elements.

Overview

If the maximum length exceeds the number of elements in the collection, the result contains all the elements in the collection.

let numbers = [1, 2, 3, 4, 5]
print(numbers.prefix(2))
// Prints "[1, 2]"
print(numbers.prefix(10))
// Prints "[1, 2, 3, 4, 5]"