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