26 lines
522 B
Markdown
26 lines
522 B
Markdown
---
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title: findKeys
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tags: object,beginner
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---
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Return all the keys in the provided object that match the given value.
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- Use `Object.keys(object)` 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 equal to the given value.
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```js
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const findKeys = (object, value) =>
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Object.keys(object).filter(key => object[key] === value);
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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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