8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
14 lines
467 B
Markdown
14 lines
467 B
Markdown
### truthCheckCollection
|
|
|
|
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
|
|
```
|