What the problem with the code ? function runner() { this.run = function() {} }; var runnerCollection = new Array(); for(var i = 0 ; i < 1000 ; i ++) { runnerCollection.push(new runner()); }

What does Date() for example return ?

What's the output? console.log({} + {});

function base(callback){ callback.call({msg:'hi'}) } function message(){ alert(this.msg) }; base(message); which is the value of alert?

Choose correct answer: 'If you delete an object prototype property, it will..........'

What is the use of isNaN function

Correct syntax for using the JavaScript exec() object method?

Which code snippet removes objects from an associative array?

Which one shows the correct result for the code below? var arr = []; arr[0] = 'Jani'; arr[1] = 'Hege'; arr[2] = 'Stale'; arr[3] = 'Kai Jim'; arr[4] = 'Borge'; console.log(arr.join()); arr.splice(2, 0, 'Lene'); console.log(arr.join());

Which will invoke the browser's Add To Favorite dialog box?

Which declaration is not valid?