17 lines
518 B
Markdown
17 lines
518 B
Markdown
---
|
|
title: truthCheckCollection
|
|
tags: object,logic,array,intermediate
|
|
---
|
|
|
|
Checks if the predicate (second argument) is truthy on all elements of a collection (first argument).
|
|
|
|
- Use `Array.prototype.every()` to check if each passed object has the specified property and if it returns a truthy value.
|
|
|
|
```js
|
|
const truthCheckCollection = (collection, pre) => collection.every(obj => obj[pre]);
|
|
```
|
|
|
|
```js
|
|
truthCheckCollection([{ user: 'Tinky-Winky', sex: 'male' }, { user: 'Dipsy', sex: 'male' }], 'sex'); // true
|
|
```
|