16 lines
508 B
Markdown
16 lines
508 B
Markdown
### mapKeys
|
|
|
|
Creates an object with keys generated by running the provided function for each key and the same values as the provided object.
|
|
|
|
Use `Object.keys(obj)` to iterate over the object's keys.
|
|
Use `Array.reduce()` to create a new object with the same values and mapped keys using `fn`.
|
|
|
|
```js
|
|
const mapKeys = (obj, fn) =>
|
|
Object.keys(obj).reduce((acc,k) => {acc[fn(obj[k], k, obj)] = obj[k]; return acc;},{});
|
|
```
|
|
|
|
```js
|
|
mapKeys({ 'a': 1, 'b': 2 }, (val, key) => key + val); // { a1: 1, b2: 2 }
|
|
```
|