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30-seconds-of-code/snippets/truthCheckCollection.md
Angelos Chalaris 97c250bcfb Updated examples
2017-12-27 16:35:25 +02:00

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### truthCheckCollection
Checks if the predicate (second argument) is truthy on all elements of a collection (first argument).
Use `Array.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
```