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) {
console.log(args.length);
}
fLength(); /** => 0 */
fLength(1, 2); /** => 2 */
fLength(1, 2, 3); /** => 3 */
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