Instance Methodswift-algorithms 1.2.1Algorithms->Swift

    rotate(subrange:toStartAt:)

    Rotates the elements within the given subrange so that the element at the specified index becomes the start of the subrange.

    Rotate.swift:245
    @discardableResult mutating func rotate(subrange: Range<Index>, toStartAt newStart: Index) -> Index
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    FNV24 hash
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    Constraints
    where Self:BidirectionalCollection

    Parameters

    subrange

    The subrange of this collection to rotate.

    newStart

    The index of the element that should be at the start of subrange after rotating.

    Returns

    The new index of the element that was at the start of subrange pre-rotation.

    Rotating a collection is equivalent to breaking the collection into two sections at the index newStart, and then swapping those two sections. In this example, the numbers array is rotated so that the element at index 3 (40) is first:

    var numbers = [10, 20, 30, 40, 50, 60, 70, 80]
let oldStart = numbers.rotate(subrange: 0..<4, toStartAt: 2)
// numbers == [30, 40, 10, 20, 50, 60, 70, 80]
// numbers[oldStart] == 10