29 lines
630 B
Markdown
29 lines
630 B
Markdown
---
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title: Find matching keys
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tags: object
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expertise: beginner
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cover: blog_images/beach-riders.jpg
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firstSeen: 2020-10-25T09:59:13+02:00
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lastUpdated: 2020-11-15T14:43:44+02:00
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---
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Finds all the keys in the provided object that match the given value.
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- Use `Object.keys()` to get all the properties of the object.
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- Use `Array.prototype.filter()` to test each key-value pair and return all keys that are equal to the given value.
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```js
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const findKeys = (obj, val) =>
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Object.keys(obj).filter(key => obj[key] === val);
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```
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```js
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const ages = {
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Leo: 20,
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Zoey: 21,
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Jane: 20,
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};
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findKeys(ages, 20); // [ 'Leo', 'Jane' ]
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```
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