freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/es6/use-the-rest-parameter-with-function-parameters/index.md

title

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Use the Rest Parameter with Function Parameters

Use the Rest Parameter with Function Parameters

Relevant LInks

• Rest parameter explanation

• Spread operator compared to rest parameter

• Video explaining spread and rest

Example

This code

const product = (function() {
  "use strict";
  return function product(n1, n2, n3) {
    const args = [n1, n2, n3];
    return args.reduce((a, b) => a * b, 1);
  };
})();
console.log(product(2, 4, 6)); //48

Can be written as such

const product = (function() {
  "use strict";
  return function product(...n) {
    return n.reduce((a, b) => a * b, 1);
  };
})();
console.log(product(2, 4, 6)); //48