30-seconds-of-code/snippets/findKeys.md

title, tags, cover, firstSeen, lastUpdated

title	tags	cover	firstSeen	lastUpdated
Find matching keys	object	beach-riders	2020-10-25T09:59:13+02:00	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.

const findKeys = (obj, val) =>
  Object.keys(obj).filter(key => obj[key] === val);

const ages = {
  Leo: 20,
  Zoey: 21,
  Jane: 20,
};
findKeys(ages, 20); // [ 'Leo', 'Jane' ]