js check if object contains 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: 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: javascript if object has key
if('key' in object)
Example 5: js check if object key exists
var obj = { key: undefined };
obj["key"] !== undefined // false, but the key exists!