how to check if a javascript object contains a key 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: js object contain key

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