wehub-resource-sync
dde272c4b8
i18n - Build Validation / Validate i18n Builds (24) (push) Has been cancelled
CI - Node.js / Lint (24) (push) Has been cancelled
CI - Node.js / Build (24) (push) Has been cancelled
CI - Node.js / Test (24) (push) Has been cancelled
CI - Node.js / Test - Upcoming Changes (24) (push) Has been cancelled
CI - Node.js / Test - i18n (italian, 24) (push) Has been cancelled
CI - Node.js / Test - i18n (portuguese, 24) (push) Has been cancelled
CD - Docker - GHCR Images / Build and Push Images (push) Has been cancelled
73 lines
1.5 KiB
Markdown
73 lines
1.5 KiB
Markdown
---
|
|
id: 56bbb991ad1ed5201cd392ce
|
|
title: Manipulate Arrays With unshift Method
|
|
challengeType: 1
|
|
forumTopicId: 18239
|
|
dashedName: manipulate-arrays-with-unshift
|
|
---
|
|
|
|
# --description--
|
|
|
|
Not only can you `shift` elements off of the beginning of an array, you can also `unshift` elements to the beginning of an array i.e. add elements in front of the array.
|
|
|
|
`.unshift()` works exactly like `.push()`, but instead of adding the element at the end of the array, `unshift()` adds the element at the beginning of the array.
|
|
|
|
Example:
|
|
|
|
```js
|
|
const ourArray = ["Stimpson", "J", "cat"];
|
|
ourArray.shift();
|
|
ourArray.unshift("Happy");
|
|
```
|
|
|
|
After the `shift`, `ourArray` would have the value `["J", "cat"]`. After the `unshift`, `ourArray` would have the value `["Happy", "J", "cat"]`.
|
|
|
|
# --instructions--
|
|
|
|
Add `["Paul", 35]` to the beginning of the `myArray` variable using `unshift()`.
|
|
|
|
# --hints--
|
|
|
|
`myArray` should now have `[["Paul", 35], ["dog", 3]]`.
|
|
|
|
```js
|
|
assert(
|
|
(function (d) {
|
|
if (
|
|
typeof d[0] === 'object' &&
|
|
d[0][0] == 'Paul' &&
|
|
d[0][1] === 35 &&
|
|
d[1][0] != undefined &&
|
|
d[1][0] == 'dog' &&
|
|
d[1][1] != undefined &&
|
|
d[1][1] == 3
|
|
) {
|
|
return true;
|
|
} else {
|
|
return false;
|
|
}
|
|
})(myArray)
|
|
);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
// Setup
|
|
const myArray = [["John", 23], ["dog", 3]];
|
|
myArray.shift();
|
|
|
|
// Only change code below this line
|
|
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
const myArray = [["John", 23], ["dog", 3]];
|
|
myArray.shift();
|
|
myArray.unshift(["Paul", 35]);
|
|
```
|