27 lines
603 B
Markdown
27 lines
603 B
Markdown
---
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title: Truth check collection
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tags: object,logic,array
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expertise: intermediate
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firstSeen: 2017-12-18T13:05:21+02:00
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lastUpdated: 2020-10-22T20:24:44+03:00
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---
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Checks if the predicate function is truthy for all elements of a collection.
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- Use `Array.prototype.every()` to check if each passed object has the specified property and if it returns a truthy value.
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```js
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const truthCheckCollection = (collection, pre) =>
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collection.every(obj => obj[pre]);
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```
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```js
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truthCheckCollection(
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[
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{ user: 'Tinky-Winky', sex: 'male' },
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{ user: 'Dipsy', sex: 'male' },
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],
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'sex'
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); // true
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```
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