diff --git a/snippets/findKeys.md b/snippets/findKeys.md new file mode 100644 index 000000000..e6b4030e3 --- /dev/null +++ b/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' ] +```