This tutorial belongs to the Swift series
A comment in Swift can take 2 forms: a single-line comment, and a multi-line comment.
A single-line comment is
//this is a comment
and it can be put at the end of a line of code:
let a = 1 //this is a comment
A multi-line comment is written using this syntax:
/* this is a multi-line comment */
Swift allows to nest multi-line comments:
/* this is a /* nested */ multi-line comment */
which is handy especially when commenting out large portions of code that already contains multi-line comments.