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snippets/js/s/map-values.md

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+---
+title: Map object values
+type: snippet
+language: javascript
+tags: [object]
+cover: feathers
+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 }
+```