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+---
+title: indexOn
+tags: array,object,intermediate
+firstSeen: 2021-06-27T05:00:00-04:00
+---
+
+Creates an object from an array, using the specified key and excluding it from each value.
+
+- Use `Array.prototype.reduce()` to create an object from `arr`.
+- Use object destructuring to get the value of the given `key` and the associated `data` and add the key-value pair to the object.
+
+```js
+const indexOn = (arr, key) =>
+  arr.reduce((obj, v) => {
+    const { [key]: id, ...data } = v;
+    obj[id] = data;
+    return obj;
+  }, {});
+```
+
+```js
+indexOn([
+  { id: 10, name: 'apple' },
+  { id: 20, name: 'orange' }
+], x => x.id);
+// { '10': { name: 'apple' }, '20': { name: 'orange' } }
+```