freeCodeCamp/curriculum/challenges/arabic/02-javascript-algorithms-and-data-structures/es6/use-the-rest-operator-with-function-parameters.arabic.md

id	title	challengeType	videoUrl	localeTitle
587d7b88367417b2b2512b47	Use the Rest Operator with Function Parameters	1

Description

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Instructions

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Tests

tests:
  - text: ''
    testString: 'assert(sum(0,1,2) === 3, "The result of <code>sum(0,1,2)</code> should be 3");'
  - text: ''
    testString: 'assert(sum(1,2,3,4) === 10, "The result of <code>sum(1,2,3,4)</code> should be 10");'
  - text: ''
    testString: 'assert(sum(5) === 5, "The result of <code>sum(5)</code> should be 5");'
  - text: ''
    testString: 'assert(sum() === 0, "The result of <code>sum()</code> should be 0");'
  - text: ''
    testString: 'getUserInput => assert(getUserInput("index").match(/function\s+sum\s*\(\s*...args\s*\)\s*{/g), "The <code>sum</code> function uses the <code>...</code> spread operator on the <code>args</code> parameter.");'

Challenge Seed

const sum = (function() {
  "use strict";
  return function sum(x, y, z) {
    const args = [ x, y, z ];
    return args.reduce((a, b) => a + b, 0);
  };
})();
console.log(sum(1, 2, 3)); // 6

Solution

// solution required