Answers for "find key in array of object js"

how to find the key of an value in an object

function getKeyByValue(object, value) {
  return Object.keys(object).find(key => object[key] === value);
}


const map = {"first" : "1", "second" : "2"};
console.log(getKeyByValue(map,"2"));

js find object that has key in array

myArray.find(x => x.id === '45').foo;