index(_:offsetBy:)

Returns an index that is the specified distance from the given index.

func index(_ i: Int, offsetBy distance: Int) -> Int

Mangled symbol

ss10ArraySliceV5index_8offsetByS2i_SitF What are these?

FNV24 hash: 7PRA0

Parameters

i: A valid index of the array.
distance: The distance to offset i.

An index offset by distance from the index i. If distance is positive, this is the same value as the result of distance calls to index(after:). If distance is negative, this is the same value as the result of abs(distance) calls to index(before:).

The following example obtains an index advanced four positions from an array’s starting index and then prints the element at that position.

let numbers = [10, 20, 30, 40, 50]
let i = numbers.index(numbers.startIndex, offsetBy: 4)
print(numbers[i])
// Prints "50"

The value passed as distance must not offset i beyond the bounds of the collection.