Variadic Functions have come to JavaScript thanks to ES2015. A Variadic Function is a function that can accept any number of arguments. For example: funcName("one"); or funcName("one", "two"); or funcName("one", "two", "three");.

It can accept any number of argguments because the total number of parameters are unknown and can be adjusted at the time the method is called.

References:

• MDN: Spread operator
• ES6 ECMAScript 6 — New Features: Overview & Comparison