Kebab file names

snippets/map-object.md

@@ -0,0 +1,24 @@
+---
+title: Map array to object
+tags: array,object
+cover: two-lighthouses
+firstSeen: 2017-12-18T12:11:58+02:00
+lastUpdated: 2020-10-21T21:54:53+03:00
+---
+
+Maps the values of an array to an object using a function.
+
+- Use `Array.prototype.reduce()` to apply `fn` to each element in `arr` and combine the results into an object.
+- Use `el` as the key for each property and the result of `fn` as the value.
+
+```js
+const mapObject = (arr, fn) =>
+  arr.reduce((acc, el, i) => {
+    acc[el] = fn(el, i, arr);
+    return acc;
+  }, {});
+```
+
+```js
+mapObject([1, 2, 3], a => a * a); // { 1: 1, 2: 4, 3: 9 }
+```