Required Instance Subscriptswift 6.0.1Swift
subscript(_:)
Accesses the element at the specified position.
override subscript(position: Self.Index) -> Self.Element { get set } Parameters
- position
The position of the element to access.
positionmust be a valid index of the collection that is not equal to theendIndexproperty.
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.
Restates
subscript(Self.Index) -> Self.Element Accesses the element at the specified position.
Other requirements
Type members
Instance members
subscript(Range<Self.Index>) -> Self.SubSequence Accesses a contiguous subrange of the collection’s elements.
func partition(by: (Self.Element) throws -> Bool) rethrows -> Self.Index Reorders the elements of the collection such that all the elements that match the given predicate are after all the elements that don’t match.
func swapAt(Self.Index, Self.Index) Exchanges the values at the specified indices of the collection.
func withContiguousMutableStorageIfAvailable<R>((inout UnsafeMutableBufferPointer<Self.Element>) throws -> R) rethrows -> R? Executes a closure on the collection’s contiguous storage.
Citizens in Swift
Default implementations
subscript<R>(R) -> Self.SubSequence subscript((UnboundedRange_) -> ()) -> Self.SubSequence subscript(Range<Self.Index>) -> Slice<Self> Accesses a contiguous subrange of the collection’s elements.