Test if something is not undefined in JavaScript

Question

I\'m checking if(response[0].title !== undefined), but I get the error:

Uncaught TypeError: Cannot read property \'title\' of undefined.<

Answer 1

Actually you must surround it with an Try/Catch block so your code won't stop from working. Like this:

try{
    if(typeof response[0].title !== 'undefined') {
        doSomething();
    }
  }catch(e){
    console.log('responde[0].title is undefined'); 
  }