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snippets/js/s/to-hash.md

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+---
+title: Iterable to hash
+type: snippet
+language: javascript
+tags: [array]
+cover: sleepy-cat
+dateModified: 2022-01-30T12:45:30+03:00
+---
+
+Reduces a given iterable into a value hash (keyed data store).
+
+- Use `Object.values()` to get the values of the iterable (object or array).
+- Use `Array.prototype.reduce()` to iterate over the values and create an object, keyed by the reference value.
+
+```js
+const toHash = (object, key) =>
+  Object.values(object).reduce((acc, data, index) => {
+    acc[!key ? index : data[key]] = data;
+    return acc;
+  }, {});
+```
+
+```js
+toHash([4, 3, 2, 1]); // { 0: 4, 1: 3, 2: 2, 3: 1 }
+toHash([{ a: 'label' }], 'a'); // { label: { a: 'label' } }
+```