object keys contains 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: js object contain key

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

Example 3: typescript check if object has key

if ('key' in myObj)

Example 4: object keys includes some key

var keyExistsOn = (o, k) => k.split(".").reduce((a, c) => a.hasOwnProperty(c) ? a[c] || 1 : false, Object.assign({}, o)) === false ? false : true;