Instance MethodSwift
prefix(_:)
Returns a subsequence, up to the specified maximum length, containing the initial elements of the collection.
Available because
Selfconforms toCollection.
func prefix(_ maxLength: Int) -> Self.SubSequenceParameters
- maxLength
The maximum number of elements to return.
maxLengthmust 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]"