20 lines
559 B
Markdown
20 lines
559 B
Markdown
---
|
|
title: allUnique
|
|
tags: array,beginner
|
|
---
|
|
|
|
Checks if all elements in an array are equal and returns`true` else returns `false`.
|
|
|
|
- Use `Array.prototype.length` property to return the number of elements in that array.
|
|
- Use `Set()` object to collect unique elements from the given array and then the `Set.prototype.size` to get the number of elements in the set
|
|
- Check the two values for equality
|
|
|
|
```js
|
|
const allUnique = myArray => myArray.length === new Set(myArray).size;
|
|
```
|
|
|
|
```js
|
|
allUnique([1,2,3,4,5]); // true
|
|
allUnique([1,1,2,3,4]); // false
|
|
```
|