Rest Parameters Back

Rest Parameters is similar to Spread Operators, which will also use ....

It allows functions to receive uncertained length of arguments:

function (a, b, ...args) {
    /** ... */

By far, in ES5, we will code like this:

function f(a, b) {
    var args = Array.prototype.slice.all(arguments, f.length);

With Rest Parameters, we can easily use an array to store rest arguments.

function fLength(...args) {

fLength();          /** => 0    */
fLength(1, 2);      /** => 2    */
fLength(1, 2, 3);   /** => 3    */
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