A function to reverse an object. For example, {a: "b", c: "d"} would become {b: "a", d: "c"}

object-reverser.js

/**
 * A function to swap keys with values
 * in a JavaScript object.
 *
 * {a: 'b', c: 'd'} => {b: 'a', d: 'c'}
 */
function reverseObject(obj) {
  const reducer = (accumulator, [key, value]) => Object.assign(accumulator, {[value]: key})
  
  return Object.entries(obj).reduce(reducer, {})
}