CODEWITHSUNDEEP
swiftzip
Frederick C. Lee
Frederick C. Lee

Reputation: 9503

What does zip do, in layman's terms?

I stumbled into 'zip' in some code I'm studying.

So I looked it up to get the following:

zip(_:_:) https://developer.apple.com/documentation/swift/1541125-zip

zip screenshot

This is about as clear as milk.

What does zip do and when would you use it?

Upvotes: 1

Views: 276

Answers (3)

Eendje
Eendje

Reputation: 8883

In addition to the given answers, I thought this would be helpful to add as an answer instead of a comment:

let a = [1, 2, 3]
let b = [1, 2, 3, 4, 5]

let c = Array(zip(a, b)) // [(1, 1), (2, 2), (3, 3)]

This is useful if you want to compare the two arrays with each other when you don't know the exact sizes of the arrays and the length is not an issue:

let d = zip(a, b).map { $0.0 + $0.1 } // [2, 4, 6]

Upvotes: 2

Jonathon Reinhart
Jonathon Reinhart

Reputation: 137438

Zip takes a pair of sequences, and turns them into a sequence of pairs.

So the two sequences:

A = 1, 2, 3
B = 4, 5, 6

Zipped become:

zip(A, B) = (1,4), (2,5), (3,6)

Upvotes: 7

anisoptera
anisoptera

Reputation: 1108

Consider two arrays, one of [Int] and one of [String]:

let a = [1, 2, 3]
let b = ["a", "b", "c"]

Then passing these two arrays to zip will get you an array of pairs containing these elements in the same order:

let c = zip(a, b) // => [(1, "a"), (2, "b"), (3, "c")]

Upvotes: 2

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