Swift - zip

While writing unit tests where I needed to test values iterating on two arrays simultaneously I realised that in Swift we can do it without using indexes or C-ish style iterators using the zip function.

let decodedData = [ ... ]
// Some array to be tested, with data generated from a parser by example

let mockData = [ ... ]
//Some array created by ourselves with well known values

XCTAssert(decodedData.count == mockData.count, "Should have the same # of items")

zip(decodedData, mockData).forEach { (decoded, mock) in
    XCTAssert(decoded.id == mock.id, "Should be equal" )
    XCTAssert(decoded.type == mock.type, "Should be equal" )
    //Etc 
}

Zip creates a sequence of pairs built out of two underlying sequences.