Comparing 2 Arrays with zip

The zip function accepts 2 parameters of type SequenceType and returns a Zip2Sequence where each element contains a value from the first sequence and one from the second sequence.

Example

let nums = [1, 2, 3]
let animals = ["Dog", "Cat", "Tiger"]
let numsAndAnimals = zip(nums, animals)

nomsAndAnimals now contains the following values

sequence1 | sequence1 | —— | —— |1 | "Dog" |2 | "Cat" |3 | "Tiger" |

This is useful when you want to perform some kind of comparation between the n-th element of each Array.

Example

Given 2 Arrays of Int(s)

let list0 = [0, 2, 4]
let list1 = [0, 4, 8]

you want to check whether each value into list1 is the double of the related value in list0.

let list1HasDoubleOfList0 = !zip(list0, list1).filter { $0 != (2 * $1)}.isEmpty