25 lines
501 B
Markdown
25 lines
501 B
Markdown
---
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title: findKeys
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tags: object,beginner
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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(obj)` 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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