prefix(_:)

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

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

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Parameters

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

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

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]"