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

title, tags

title	tags
findKeys	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.

const findKeys = (object, value) =>
  Object.keys(object).filter(key => object[key] === value);

const ages = {
  "Leo" : 20,
  "Zoey" : 21,
  "Jane" : 20
};

findKeys(ages, 20); // [ "Leo", "Jane" ]