javascript check if a key is in an object 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: typescript check if object has key

if ('key' in myObj)

Example 3: check object has key javascript

Object.prototype.hasOwnProperty()

Example 4: javascript if object has key

if('key' in object)