Understanding the spread operator in JavaScript

as per:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Spread_syntax

Spread syntax (...) allows an iterable such as an array expression or string to be expanded in places where zero or more arguments (for function calls) or elements (for array literals) are expected, or an object expression to be expanded in places where zero or more key-value pairs (for object literals) are expected.

In this video, I show how to use it and why you should :) ... https://www.youtube.com/watch?v=AlIRqbVTxiQ