freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/es6/declare-a-read-only-variable-with-the-const-keyword/index.md

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Declare a Read-Only Variable with the const Keyword

Declare a Read-Only Variable with the const Keyword

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Problem Explanation

Change all the variables to let or const and rename sentence.

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Hints

Hint 1

• Replace var for string with read-only const.

Hint 1

• Replace var in for loop to let.

Hint 1

• Common convention is to name const variables with ALL CAPS.

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Solutions

Solution 1 (Click to Show/Hide)

function printManyTimes(str) {
  "use strict";
  const SENTENCE = str + " is cool!";
  for (let i = 0; i < str.length; i += 2) {
    console.log(SENTENCE);
  }
}
printManyTimes("freeCodeCamp");

Code Explanation

By using const on sentence we can make it read-only and by using let on i inside the for loop we can avoid using var all together. For added code clarity we can also change sentence to SENTENCE to show that it is a constant.

Relevant Links

• const
• let