@allenfuture/lotide/findKeyByValue.js

Support [flatten] test

const assertEqual = function(actual, expected) {
  if (actual === expected) {
    console.log(`✅✅✅Assertion Passed: ${actual} === ${expected}`);
  } else {
    console.log(`❌❌❌Assertion Failed: ${actual} !== ${expected}`);
  }
};

// new code
const findKeyByValue = function(obj, value) {
  for (let key in obj) {
    if (obj[key] === value) {
      return key;
    }
  }
  return undefined;
};


// test cases
// 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);

module.exports = findKeyByValue;