Javascript IQ

Javascript blackmails because you don’t know its truth. Test how much truth you know.

Quiz 1 –

(function f(){
   function f(){ return 1; }
   return f();
   function f(){ return 2; }
})();

Quiz 2 –

(function f(){
  var f = function() { return 1; }
  return f();
  var f = function() { return 2; }
})();

Quiz 3 –

(function(foo){
  return typeof foo.bar;
})({ foo: { bar: 1 } });

Quiz 3 –

(function(foo){
  return typeof foo.foo.bar;
})({ foo: { bar: 1 } });

Quiz 4 –

(function f(){
  var f = function() { return 1; }
  return f();
  function f() { return 2; }
})();

Quiz 5 –

(function f(){
  function f() { return 2; }
  return f();
  var f = function() { return 1; } 
})();

Quiz 6 –

(function f(){
  return f();
  var f = function() { return 1; } 
})();

Quiz 7 –

(function f(){
  return f();
  var f = function() { return 1; } 
  function f() { return 2; }
})(); 

Quiz 8 –

typeof undefined

Quiz 9 –

typeof typeof undefined

Quiz 10 –

[typeof x, typeof y][1];

Quiz 11 –

var x = 1;
if (function f(){}) {
 x += typeof f;
}
x;

Quiz 12 –

1 + undefined

Quiz 13 –

var x = (1, 2, 3); 
x

Quiz 14 –

var x = 10;
function z(){
   var a = x = 20;
   console.log(a);
}
z();
console.log(x);

Quiz 15 –

var x = 10;
function z(){
   var x = x = 20;
   console.log(x);
}
z();
console.log(x);

Quiz 16 –

true + false + true > true - false

Quiz 17 –

typeof true + false + true

Quiz 18 –

-'-1'

Quiz 19 –

-'-a'

Quiz 20 –

1 + '1'

Quiz 21 –

+ '1'

Quiz 22 –

function b(x, y, a) {
 arguments[2] = 10;
 alert(a);
}
b(1, 2, 3);