PairIterator

public struct PairIterator<T, U> : Sequence, IteratorProtocol where T : Sequence, U : Sequence

An iterator that iterates over pairs of elements in firstSequence and secondSequence. secondSequence must not destructively consume its contents.

For example, the first element generated is (firstSequence[0], secondSequence[0]), the second element is (firstSequence[0], secondSequence[1]), all the way to (firstSequence[0]. secondSequence.last), at which point the next element is (firstSequence[1], secondSequence[0]).

for (x, y) in pairs(firstSequence, secondSequence) {
    //...
}

is equivalent to

for x in firstSequence {
    for y in secondSequence {
        //...
    }
}

  • Initializes a PairIterator instance.

    • paramter firstSequence: The first sequence to iterate over.

    Declaration

    Swift

    public init(firstSequence: T, secondSequence: U)

    Parameters

    secondSequence

    The second sequence to iterate over.

  • Returns the next element in the sequence, or nil if the sequence is done iterating.

    Declaration

    Swift

    public mutating func next() -> (T.Element, U.Element)?

    Return Value

    A tuple containing an element in the first sequence and an element in the second sequence.

  • Returns an iterator that can be

    Declaration

    Swift

    public func makeIterator() -> PairIterator<T, U>