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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
This commit is contained in:
Adrian Skar
2019-03-25 23:55:20 +01:00
committed by Randell Dawson
parent e4870c472a
commit 772f4e1c40
1 changed files with 10 additions and 20 deletions
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guide/english/certifications/javascript-algorithms-and-data-structures/es6/compare-scopes-of-the-var-and-let-keywords/index.md
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@@ -1,22 +1,20 @@
--- ---
title: Compare Scopes of the var and let Keywords 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:") ![: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 ## ![: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_ > _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_ > _try to solve the problem now_
## Spoiler Alert! ## 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; 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. By using `let` you can declare variables in relation to their scope.
#### Relevant Links ### Resources
- ["let" - *MDN Javascript reference*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let)
* <a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/let' target='_blank' rel='nofollow'>let</a> - [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.
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