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snippets/js/s/objectify.md

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+---
+title: Map an array to an object
+type: snippet
+language: javascript
+tags: [array,object]
+author: chalarangelo
+cover: metro-tunnel
+dateModified: 2023-02-04T05:00:00-04:00
+---
+
+Maps an object array to an object, using the provided mapping functions.
+
+- Use `Array.prototype.reduce()` to map the array to an object.
+- Use `mapKey` to map the keys of the object and `mapValue` to map the values.
+
+```js
+const objectify = (arr, mapKey, mapValue = i => i) =>
+  arr.reduce((acc, item) => {
+    acc[mapKey(item)] = mapValue(item);
+    return acc;
+  }, {});
+```
+
+```js
+const people = [ { name: 'John', age: 42 }, { name: 'Adam', age: 39 } ];
+objectify(people, p => p.name.toLowerCase());
+// { john: { name: 'John', age: 42 }, adam: { name: 'Adam', age: 39 } }
+objectify(
+  people,
+  p => p.name.toLowerCase(),
+  p => p.age
+);
+// { john: 42, adam: 39 }
+```