js object has keys code example

Example 1: how to check if object has key javascript

myObj.hasOwnProperty('key') // it checks object for particular key and not on prototype

Example 2: object.keys

const object1 = {
  a: 'somestring',
  b: 42,
  c: false
};

console.log(Object.keys(object1));
// expected output: Array ["a", "b", "c"]

Example 3: javascript if object has key

if('key' in object)

Example 4: object.keys javascript

const object1 = {
  a: 'somestring',
  b: 42,
  c: false
};

console.log(Object.keys(object1));

Example 5: js object contain key

if ('key' in myObj)
// better
if (!myObj.hasOwnProperty('key'))