Subscript

subscript(_:)

Accesses the element at the specified position.

Required. Default implementation provided.

Declaration

override subscript(position: Self.Index) -> Self.Element { get set }

Parameters

position: The position of the element to access. position must be a valid index of the collection that is not equal to the endIndex property.

Discussion

For example, you can replace an element of an array by using its subscript.

var streets = ["Adams", "Bryant", "Channing", "Douglas", "Evarts"]
streets[1] = "Butler"
print(streets[1])
// Prints "Butler"

You can subscript a collection with any valid index other than the collection’s end index. The end index refers to the position one past the last element of a collection, so it doesn’t correspond with an element.

Complexity: O(1)

Default Implementations

MutableCollection Implementations

subscript((UnboundedRange_) -> ()) -> Self.SubSequence

subscript<R>(R) -> Self.SubSequence

subscript(Range<Self.Index>) -> Slice<Self>

Accesses a contiguous subrange of the collection’s elements.