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fix(guide): ES6 destructuring assignment with the rest operator (#35681)

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* fix(guide): ES6 destructuring assignment with the rest operator

Minor fixes/enhancements.

* Update guide/english/certifications/javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-with-the-rest-operator-to-reassign-array-elements/index.md

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

* Update guide/english/certifications/javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-with-the-rest-operator-to-reassign-array-elements/index.md

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

* Update guide/english/certifications/javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-with-the-rest-operator-to-reassign-array-elements/index.md

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

* Fixes for solutions 

Copy/paste friendly code as discussed.

* Update guide/english/certifications/javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-with-the-rest-operator-to-reassign-array-elements/index.md

Co-Authored-By: AdrianSkar <adrian@adrianskar.com>
This commit is contained in:
Adrian Skar
2019-03-29 17:40:13 +01:00
committed by Randell Dawson
parent 914a7c522d
commit 08bdc8640e
1 changed files with 30 additions and 18 deletions
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48
guide/english/certifications/javascript-algorithms-and-data-structures/es6/use-destructuring-assignment-with-the-rest-operator-to-reassign-array-elements/index.md
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@ -2,7 +2,7 @@
title: Use Destructuring Assignment with the Rest Operator to Reassign Array Elements
---
## Use Destructuring Assignment with the Rest Operator to Reassign Array Elements
<!-- The article goes here, in GitHub-flavored Markdown. Feel free to add YouTube videos, images, and CodePen/JSBin embeds -->
Remember that the rest operator allows for variable numbers of arguments. In this challenge, you have to get rid of the first two elements of an array.
## Hint 1:
@ -13,10 +13,9 @@ Assign the first two elements to two random variables.
Set the remaining part of the array to `...arr`.
=======
## Hint 1
## Hint 3:
Use destructuring to create the `arr` variable.
Use destructuring to create the `arr` variable:
```javascript
function removeFirstTwo(list) {
@ -28,9 +27,9 @@ function removeFirstTwo(list) {
}
```
## Hint 2
## Hint 4:
Spread the `list` parameter into `arr`.
Spread the `list` parameter values into `arr`.
```javascript
function removeFirstTwo(list) {
@ -42,11 +41,29 @@ function removeFirstTwo(list) {
}
```
## Hint 3
Exclude the first two elements of the `arr` array with `,,`.
## Spoiler Alert - Solution Ahead!
You can use random variables to omit the first two values:
```javascript
const source = [1,2,3,4,5,6,7,8,9,10];
function removeFirstTwo(list) {
"use strict";
// change code below this line
const [a, b, ...arr] = list;
// change code above this line
return arr;
}
const arr = removeFirstTwo(source);
console.log(arr); // should be [3,4,5,6,7,8,9,10]
console.log(source); // should be [1,2,3,4,5,6,7,8,9,10];
```
## Solution 2:
You can also exclude the first two elements of the `arr` array using `,,`.
```javascript
const source = [1,2,3,4,5,6,7,8,9,10];
function removeFirstTwo(list) {
"use strict";
// change code below this line
@ -54,16 +71,11 @@ function removeFirstTwo(list) {
// change code above this line
return arr;
}
const arr = removeFirstTwo(source);
console.log(arr); // should be [3,4,5,6,7,8,9,10]
console.log(source); // should be [1,2,3,4,5,6,7,8,9,10];
```
## Spoiler Alert - Solution Ahead!
### Resources
```javascript
function removeFirstTwo(list) {
"use strict";
// change code below this line
const [a, b, ...arr] = list;
// change code above this line
return arr;
}
```
- ["Destructuring assignment" - *MDN JavaScript reference*](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment)