Merge pull request #1697 from jun-low/jun/feat-find-keys

feat: add findKeys snippet

snippets/findKeys.md

@@ -0,0 +1,24 @@
+---
+title: findKeys
+tags: object,beginner
+---
+
+Finds all the keys in the provided object that match the given value.
+
+- Use `Object.keys(obj)` 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' ]
+```