How can I find the operator definition in Swift?

Question

I write code below:

let array1: [Int] = [0,1]
let array2 = array1 + [2]

It just works.I want to find where + operator define.

Answer 1

You can select the operator in the Xcode source editor, and choose "Navigate -> Jump to definition" from the menu, or press CMD+CTRL+J.

(This was broken in Xcode 10, but works again in Xcode 11, which is currently in beta.)