20 lines
604 B
Markdown
20 lines
604 B
Markdown
### mapValues
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Creates an object with the same keys as the provided object and values generated by running the provided function for each value.
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Use `Object.keys(obj)` to iterate over the object's keys.
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Use `Array.reduce()` to create a new object with the same keys and mapped values using `fn`.
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```js
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const mapValues = (obj, fn) =>
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Object.keys(obj).reduce((acc,k) => {acc[k] = fn(obj[k], k, obj); return acc;},{});
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```
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```js
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const users = {
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'fred': { 'user': 'fred', 'age': 40 },
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'pebbles': { 'user': 'pebbles', 'age': 1 }
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};
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mapValues(users, u => u.age); // { fred: 40, pebbles: 1 }
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```
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