Quiz JavaScript Programming Languages

Questions of the day - JavaScript Programming Languages

(function(){ return typeof arguments; })();

object
array
arguments
undefined

var f = function g(){ return 23; }; typeof g();

number
undefined
function
Error

(function(x){ delete x; return x; })(1);

1
null
undefined
Error

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

number
undefined
function
Error

var foo = { bar: function() { return this.baz; }, baz: 1 }; (function(){ retu

undefined
object
number
function

var f = (function f(){ return "1"; }, function g(){ return 2; })(); typeof f;

string
number
function
undefined

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

1function
1
1undefined
NaN

var x = [typeof x, typeof y][1]; typeof typeof x;

string
number
object
undefined

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

object
undefined
Error
number

with (function(x, undefined){}) length;

undefined
Error
2
1

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