23 lines
612 B
Markdown
23 lines
612 B
Markdown
---
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title: Common keys
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tags: object
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author: chalarangelo
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cover: blog_images/symmetry-cloudy-mountain.jpg
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firstSeen: 2022-04-23T05:00:00-04:00
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---
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Finds the common keys between two objects.
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- Use `Object.keys()` to get the keys of the first object.
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- Use `Object.prototype.hasOwnProperty()` to check if the second object has a key that's in the first object.
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- Use `Array.prototype.filter()` to filter out keys that aren't in both objects.
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```js
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const commonKeys = (obj1, obj2) =>
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Object.keys(obj1).filter(key => obj2.hasOwnProperty(key));
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```
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```js
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commonKeys({ a: 1, b: 2 }, { a: 2, c: 1 }); // ['a']
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```
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