lotide/findKey.js at master · mab321/lotide · GitHub

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const assertEqual = function(actual, expected) {
  if (actual === expected) {
    console.log(`💚💚💚 Assertion Passed: ${actual} === ${expected}`);

  } else {
    console.log(`🔴🔴🔴 Assertion Failed: ${actual} !==  ${expected}`);
  }

};

const findKey = (obj, cB)=>{
  for(const item in obj){

    if(cB(obj[item])){
      return item;
    }
  }
  return undefined;

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