findKey.js

const findKey = function(object, callback) {
  // for.. in iterates through objects. let key be the iterating variable.
  for (let key in object) {
    // execute the callback function, which takes on 1 parameter.
    if (callback(object[key])) 
    return key;
  }
};

// findKey function has 2 parameters: findKey(object, callback)

module.exports = findKey;


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

const assertEqual = require('./assertEqual');


assertEqual(findKey({
  "Blue Hill": { stars: 1 },
  "Akaleri":   { stars: 3 },
  "noma":      { stars: 2 },
  "elBulli":   { stars: 3 },
  "Ora":       { stars: 2 },
  "Akelarre":  { stars: 3 }
}, x => x.stars === 2), "noma");

assertEqual(findKey({
  "Blue Hill": { stars: 1 },
  "Akaleri":   { stars: 3 },
  "noma":      { stars: 2 },
  "elBulli":   { stars: 3 },
  "Ora":       { stars: 2 },
  "Akelarre":  { stars: 3 }
}, x => x.stars === 2), "Blue Hill");

assertEqual(findKey({
  "Blue Hill": { stars: 1 },
  "Akaleri":   { stars: 3 },
  "noma":      { stars: 2 },
  "elBulli":   { stars: 3 },
  "Ora":       { stars: 2 },
  "Akelarre":  { stars: 3 }
}, x => x.stars === 2), "Ora");

assertEqual("Lighthouse Labs", "Bootcamp");
assertEqual(1, 1);