@veremenko/lotide/findKeyByValue.js

Lodash alike library

// //Emojis
// const pass = String.fromCodePoint(0x1F600);
// const fale = String.fromCodePoint(0x1F47A);

// // Function implementation
// const assertEqual = function(actual, expected) {
//   if (actual === expected) {
//     console.log(pass, pass, pass, `Assertion Passed: ${actual} === ${expected}`);
//   } else {
//     console.log(fale, fale, fale, `Assertion Failed: ${actual} !== ${expected}`);
//   }
// };

const findKeyByValue = function(object, value) {
  
  //console.log('object received: ', object);
  
  let keys = Object.keys(object);
  //console.log(keys);
  
  for (let item of keys) {
    if (object[item] === value) {
      console.log('Got it!', item);
      return item;
    }

  }

};

module.exports = findKeyByValue;

// //Test code

// const testObj = {
//   key1: "this",
//   key2: "that",
//   key3: "other"
// };

// findKeyByValue(testObj, "other");



// const bestTVShowsByGenre = {
//   sci_fi: "The Expanse",
//   comedy: "Brooklyn Nine-Nine",
//   drama:  "The Wire"
// };

// assertEqual(findKeyByValue(bestTVShowsByGenre, "The Wire"), "drama");
// assertEqual(findKeyByValue(bestTVShowsByGenre, "That '70s Show"), undefined);
// assertEqual(findKeyByValue(bestTVShowsByGenre, "That '70s Show"), "comedy");