diff --git a/snippets/findKeys.md b/snippets/findKeys.md new file mode 100644 index 000000000..b59a55f0d --- /dev/null +++ b/snippets/findKeys.md @@ -0,0 +1,25 @@ +--- +title: findKeys +tags: object,beginner +--- + +Return all the keys in the provided object that match the given value. + +- Use `Object.keys(object)` to get all the properties of the object. +- Use `Array.prototype.filter()` to test each key-value pair and return all keys that equal to the given value. + + +```js +const findKeys = (object, value) => + Object.keys(object).filter(key => object[key] === value); +``` + +```js +const ages = { + "Leo" : 20, + "Zoey" : 21, + "Jane" : 20 +}; + +findKeys(ages, 20); // [ "Leo", "Jane" ] +```