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

Mutate an Array Declared with const

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Problem Explanation

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

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Hints

Hint 1

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

Hint 1

• To access array value use array[index]

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Solutions

Solution 1 (Click to Show/Hide)

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

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