The rest parameter syntax allows a function to accept an indefinite number of arguments as an array, providing a way to represent variadic functions in JavaScript.

Now, What is variadic function ?

In mathematics and in computer programming, a variadic function is a function of indefinite arity, i.e., one which accepts a variable number of arguments. Support for variadic functions differs widely among programming languages.

What is Rest parameter

A function definition’s last parameter can be prefixed with “...” , which will cause all remaining (user supplied) parameters to be placed within a “standard” JavaScript array.. Only the last parameter in a function definition can be a rest parameter.

JavaScript Demo: Functions Rest Parameters