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javascript/snippets/find-keys.md

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+---
+title: Find matching keys
+type: snippet
+tags: [object]
+cover: beach-riders
+dateModified: 2020-11-15T14:43:44+02:00
+---
+
+Finds all the keys in the provided object that match the given value.
+
+- Use `Object.keys()` to get all the properties of the object.
+- Use `Array.prototype.filter()` to test each key-value pair and return all keys that are equal to the given value.
+
+
+```js
+const findKeys = (obj, val) =>
+  Object.keys(obj).filter(key => obj[key] === val);
+```
+
+```js
+const ages = {
+  Leo: 20,
+  Zoey: 21,
+  Jane: 20,
+};
+findKeys(ages, 20); // [ 'Leo', 'Jane' ]
+```