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[Guide] ES6: Compare var and let scopes. Fixes and enhancements. (#34636)

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* [Guide] ES6: Compare var and let scopes. Fixes and enhancements.

- Remove phantom image
- Remove notes for contributors
- Change explanation and hints so they don't provide the solution too early.
- Links to markdown + 2 more resources

* Update guide/english/certifications/javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords/index.md

Co-Authored-By: AdrianSkar <adrian@adrianskar.com>

* Update guide/english/certifications/javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords/index.md

Co-Authored-By: AdrianSkar <adrian@adrianskar.com>

* Update guide/english/certifications/javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords/index.md

Co-Authored-By: AdrianSkar <adrian@adrianskar.com>

* Update guide/english/certifications/javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords/index.md

Co-Authored-By: AdrianSkar <adrian@adrianskar.com>

* Update guide/english/certifications/javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords/index.md

Co-Authored-By: AdrianSkar <adrian@adrianskar.com>

* fix: clarified the hint regarding variable i
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Adrian Skar
2019-03-25 23:55:20 +01:00
committed by Randell Dawson
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commit 772f4e1c40
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---
title: Compare Scopes of the var and let Keywords
---
![](//discourse-user-assets.s3.amazonaws.com/original/2X/3/3c8584a085a0deaea66b3400e6321eeadab552a2.jpg)
![:triangular_flag_on_post:](https://forum.freecodecamp.com/images/emoji/emoji_one/triangular_flag_on_post.png?v=3 ":triangular_flag_on_post:") Remember to use <a>**`Read-Search-Ask`**</a> if you get stuck. Try to pair program ![:busts_in_silhouette:](https://forum.freecodecamp.com/images/emoji/emoji_one/busts_in_silhouette.png?v=3 ":busts_in_silhouette:") and write your own code ![:pencil:](https://forum.freecodecamp.com/images/emoji/emoji_one/pencil.png?v=3 ":pencil:")
### Problem Explanation:
## Problem Explanation:
We need to change `var` to `let` in our function scope and add `let` to our block scope.
Change the code so that the variable `i` declared in the if block is separately scoped than the variable `i` declared at the beginning of the function.
## ![:speech_balloon:](https://forum.freecodecamp.com/images/emoji/emoji_one/speech_balloon.png?v=3 ":speech_balloon:") Hint: 1
* Find `var` and replace with `let`.
* _Be certain not to use the `var` keyword anywhere in your code._
> _try to solve the problem now_
* Add `let` to the variable `i` inside of your if statement.
* _Remember that `let`'s scope is limited to the block, function or statement in which you declare it._
> _try to solve the problem now_
## Spoiler Alert!
@ -38,21 +36,13 @@ We need to change `var` to `let` in our function scope and add `let` to our bloc
return i;
}
```
![:rocket:](https://forum.freecodecamp.com/images/emoji/emoji_one/rocket.png?v=3 ":rocket:") <a href='https://codepen.io/dylantyates/pen/wxwxRd' target='_blank' rel='nofollow'>Run Code</a>
# Code Explanation:
## Code Explanation:
By using `let` you can declare variables in relation to their scope.
#### Relevant Links
* <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let' target='_blank' rel='nofollow'>let</a>
## ![:clipboard:](https://forum.freecodecamp.com/images/emoji/emoji_one/clipboard.png?v=3 ":clipboard:") NOTES FOR CONTRIBUTIONS:
* ![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **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.
* Add an explanation of your solution.
* Categorize the solution in one of the following categories — **Basic**, **Intermediate** and **Advanced**. ![:traffic_light:](https://forum.freecodecamp.com/images/emoji/emoji_one/traffic_light.png?v=3 ":traffic_light:")
* Please add your username only if you have added any **relevant main contents**. (![:warning:](https://forum.freecodecamp.com/images/emoji/emoji_one/warning.png?v=3 ":warning:") **_DO NOT_** _remove any existing usernames_)
> See ![:point_right:](https://forum.freecodecamp.com/images/emoji/emoji_one/point_right.png?v=3 ":point_right:") <a href='http://forum.freecodecamp.com/t/algorithm-article-template/14272' target='_blank' rel='nofollow'>**`Wiki Challenge Solution Template`**</a> for reference.
### Resources
- ["let" - *MDN Javascript reference*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let)
- [Rauschmayer, Axel. "Variables and scoping in ECMAScript 6". *2ality.com*, 2015-02-07.](http://2ality.com/2015/02/es6-scoping.html) Accessed 11 Dec 2018.
- [Bos, Wes. "Quick Tip: Use let with for Loops in JavaScript". *wesbos.com*, 16 Aug 2016.](https://wesbos.com/for-of-es6/) Accessed 11 Dec 2018.