66 lines
3.8 KiB
Markdown
66 lines
3.8 KiB
Markdown
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---
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title: Declare a Read-Only Variable with the const Keyword
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---
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 Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program  and write your own code 
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### Problem Explanation:
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Change all the variables to `let` or `const` and rename `sentence`.
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##  Hint: 1
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* Replace `var` for string with read-only `const`.
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> _try to solve the problem now_
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##  Hint: 1
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* Replace `var` in `for` loop to `let`.
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> _try to solve the problem now_
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##  Hint: 1
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* Common convention is to name `const` variables with ALL CAPS.
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> _try to solve the problem now_
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## Spoiler Alert!
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**Solution ahead!**
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##  Basic Code Solution:
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```javascript
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function printManyTimes(str) {
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"use strict";
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const SENTENCE = str + " is cool!";
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for(let i = 0; i < str.length; i+=2) {
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console.log(SENTENCE);
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}
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}
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printManyTimes("freeCodeCamp");
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```
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 <a href='https://codepen.io/dylantyates/pen/OwVxyx' target='_blank' rel='nofollow'>Run Code</a>
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# Code Explanation:
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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.
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#### Relevant Links
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* <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/const' target='_blank' rel='nofollow'>const</a>
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* <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let' target='_blank' rel='nofollow'>let</a>
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##  NOTES FOR CONTRIBUTIONS:
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*  **DO NOT** add solutions that are similar to any existing solutions. If you think it is **_similar but better_**, then try to merge (or replace) the existing similar solution.
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* Add an explanation of your solution.
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* Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. 
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* Please add your username only if you have added any **relevant main contents**. ( **_DO NOT_** _remove any existing usernames_)
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> See  <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.
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