Why do I need underscores in swift?

Question

Here it says, \"Note: the _ means “I don’t care about that value”\", but coming from JavaScript, I don\'t understand what that means.

The only way I can

Answer 1

In addition to the accepted answer, one of the use cases of _ is when you need to write a long number in code

More readable number

This is not easy human readable:

let x = 1000000000000

You can add _ in the number to make it more human readable:

let x = 1_000_000_000_000