Inverting a Hash.js

/*
Description:
Summary
Given a Hash made up of keys and values, invert the hash by swapping them.

Examples
Given:

  { a: '1',
    b: '2',
    c: '3' }

Return:

  { 1: 'a',
    2: 'b',
    3: 'c' }



Given:

  { foo:   'bar',
    hello: 'world' }

Return:

  { bar:   'foo',
    world: 'hello' }
Notes
Keys and values may be of any type appropriate for use as a key.
All hashes provided as input will have unique values, so the inversion is involutive. In other words, do not worry about identical values stored under different keys.
*/
function invertHash(hash) {
  const values = Object.values(hash)
  const keys = Object.keys(hash)
  const obj={}
  values.map((v,i)=>obj[v]=keys[i])
  return obj
}