freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/es6/mutate-an-array-declared-with-const/index.md

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Mutate an Array Declared with const

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Problem Explanation:

Reassign the values of the const variable s using various element assignment.

Hint: 1

• You can change array values on const like you can with var or let.

try to solve the problem now

Hint: 1

• To access array value use array[index]

try to solve the problem now

Spoiler Alert!

Solution ahead!

Basic Code Solution:

    const s = [5, 7, 2];
    function editInPlace() {
      "use strict";
      s[0] = 2;
      s[1] = 5;
      s[2] = 7;
    }
    editInPlace();

Run Code

Code Explanation:

Trying to reassign a read-only const variable will throw an error, but by using various element assignment you can access and change the value of an array just like you would with let or var.

Relevant Links

• const
• Array

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