Operator overloading

Swift supports operator overloading, which is a fancy way of saying that what an operator does depends on the values you use it with. For example, + sums integers like this:

let meaningOfLife = 42
let doubleMeaning = 42 + 42

But + also joins strings, like this:

let fakers = "Fakers gonna "
let action = fakers + "fake"

You can even use + to join arrays, like this:

let firstHalf = ["John", "Paul"]
let secondHalf = ["George", "Ringo"]
let beatles = firstHalf + secondHalf

Remember, Swift is a type-safe language, which means it won’t let you mix types. For example, you can’t add an integer to a string because it doesn’t make any sense.

SPONSORED From August 2nd to 8th you can join a FREE crash course for mid/senior iOS devs who want to achieve an expert level of technical and practical skills – it’s the fast track to being a complete senior developer!

Save your spot now

Sponsor Hacking with Swift and reach the world's largest Swift community!