How to compare two tuples for equality

Swift version: 5.1

Paul Hudson @twostraws May 28th 2019

Swift 2.2 introduced the ability to compare two tuples up to arity six, which means the tuples can contain no more than six elements. To compare tuples, just use the == operator, like this:

let singer = ("Taylor", "Swift")
let alien = ("Justin", "Bieber")

if singer == alien {
    print("Matching tuples!")
} else {
    print("Non-matching tuples!")
}

Warning: if you use labels, these are not evaluated when comparing two tuples. So, the code below will print "Matching tuples!" even though the labels are different:

let taylor = (first: "Taylor", last: "Swift")
let bird = (name: "Taylor", type: "Swift")

if taylor == bird {
    print("Matching tuples!")
} else {
    print("Non-matching tuples!")
}

Available from iOS 7.0