30 lines
712 B
Markdown
30 lines
712 B
Markdown
---
|
|
title: Map object values
|
|
type: snippet
|
|
language: javascript
|
|
tags: [object]
|
|
cover: travel-mug-1
|
|
dateModified: 2020-10-21T21:54:53+03:00
|
|
---
|
|
|
|
Maps the values of an object using the provided function, generating a new object with the same keys.
|
|
|
|
- Use `Object.keys()` to iterate over the object's keys.
|
|
- Use `Array.prototype.reduce()` to create a new object with the same keys and mapped values using `fn`.
|
|
|
|
```js
|
|
const mapValues = (obj, fn) =>
|
|
Object.keys(obj).reduce((acc, k) => {
|
|
acc[k] = fn(obj[k], k, obj);
|
|
return acc;
|
|
}, {});
|
|
```
|
|
|
|
```js
|
|
const users = {
|
|
fred: { user: 'fred', age: 40 },
|
|
pebbles: { user: 'pebbles', age: 1 }
|
|
};
|
|
mapValues(users, u => u.age); // { fred: 40, pebbles: 1 }
|
|
```
|