prefix(_:)
Returns a sequence, up to the specified maximum length, containing the initial elements of the sequence.
Declaration
func prefix(_ maxLength: Int) -> PrefixSequence<Self>Parameters
- maxLength:
The maximum number of elements to return. The value of
maxLengthmust be greater than or equal to zero.
Return Value
A sequence starting at the beginning of this sequence with at most maxLength elements.
Discussion
If the maximum length exceeds the number of elements in the sequence, the result contains all the elements in the sequence.
let numbers = [1, 2, 3, 4, 5]
print(numbers.prefix(2))
// Prints "[1, 2]"
print(numbers.prefix(10))
// Prints "[1, 2, 3, 4, 5]"