Fun With JavaScript

FUN WITH JAVASCRIPT  :)                   
===========PROBLEM-1======================
var foo = function foo() {
    console.log(foo === foo);  
};
foo();

Ans -
True <-
False
Error

===========PROBLEM-2======================
typeof(Number("1") - 1 == 0);

Ans-
function
number
object
undefined
boolean <-

===========PROBLEM-3======================(come-back)

function aaa() {
    return
    {
        test: 1
    };
}
alert(typeof aaa());

Ans-
true
false
undefined <-

===========PROBLEM-4======================

(true + false) > 2 + true;

Ans-
true
false <-
TypeError
NaN

===========PROBLEM-5======================
function bar() {
    return foo;
    foo = 10;
    function foo() {}
    var foo = '11';
}
alert(typeof bar());

Ans-
number
function
undefined <-
string
error

===========PROBLEM-6======================

"1" - - "1";
1- -1
1 + 1
2

Ans-
0
2 <-
11
"11"

===========PROBLEM-7======================
var x = 3;

var foo = {
    x: 2,
    baz: {
        x: 1,
        bar: function() {
            return this.x;
        }
    }
}

var go = foo.baz.bar;

clg(go());
clg(foo.baz.bar());

Ans-
What is the output ?
> 3
> 1

===========PROBLEM-8======================

new String("This is a string") instanceof String;

Ans-
true <-
false
TypeError

===========PROBLEM-9======================
new String("") === typeof(string)

Ans-
true
false <-
TypeError

===========PROBLEM-10======================
[] + [] + 'foo'.split('');

Ans-
"f, o, o" <-
TypeError
["f", "o", "o"]
[][]["f", "o", "o"]

===========PROBLEM-11======================
new Array(5).toString();

Ans-
",,,," <-
[]
"[]"
TypeError

===========PROBLEM-12======================
var myArr = ['foo', 'bar', 'baz'];
myArr.length = 0;
myArr.push('bin');
console.log(myArr);

Ans-
What is the output ?
>

===========PROBLEM-13======================
String('Hello') === 'Hello';

Ans-
true <-
false
TypeError

===========PROBLEM-14======================
var x = 0;
function foo() {
    x++;
    this.x = x;
    return foo;
}
var bar = new new foo;
console.log(bar.x);

Ans-
Referrence Error
TypeError
undefined <-
0
1

===========PROBLEM-15======================
"This is a string" instanceof String;

Ans-
True 
False <-
TypeError

===========PROBLEM-16======================
var bar = 1,
    foo = {};

foo = {
    bar: 2,
    baz: ++bar
};
foo.baz + foo.bar + bar;

Ans-
TypeError
ReferrenceError
Undefined
NaN
null
4
5
6<-

===========PROBLEM-17======================
var myArr = ['foo', 'bar', 'baz'];
myArr[2];
console.log('2' in myArr);

Ans-
What is the output?
>true

===========PROBLEM-18======================

var arr = [];
arr[0]  = 'a';
arr[1]  = 'b';
arr.foo = 'c';
alert(arr.length);

Ans-
1
2 <-
3
undefined

===========PROBLEM-19======================
10 > 9 > 8 === true

Ans-
What is the output?
> false


===========PROBLEM-20======================
function foo(a, b) {
    arguments[1] = 2;
    alert(b);
}
foo(1);

Ans-
What is the output of alert?
> undefined -> Learn arguments concept

===========PROBLEM-21======================
NaN === NaN;

Ans-
What is the output?
> false


===========PROBLEM-22======================

a = 10;
function foo(){
a = 30;
    return {
         a 
    }
}
console.log(a);
foo()
console.log(foo.a)
console.log(foo().a)

Ans-
What is the output ?
>
 10 , undefined, 30

===========PROBLEM-23======================
console.log('op1',a)

foo = () =>{
a = 30;
}

console.log('op2',a)

a = 50;

console.log('op3',a)

function foo(){
a = 10;
}
console.log('op4',a)

Ans-
Write the output in sequence ?
>

===========PROBLEM-24======================
function Cat(cname, ccolor) {
    this.catName = cname;
    this.catColor = ccolor;
    catEyes = 'blue';
}
Cat.prototype.age = 12;

var catC = new Cat("Fluffy", "White");

console.log('op1',Cat.catName);
console.log('op2',catC.catName);
console.log('op3',Cat.prototype.age);
console.log('op4',catC.prototype.age);
console.log('op5',Cat.__proto__.age);
console.log('op6',catC.__proto__.age);

Ans-
Write the output in sequence ?
>

===========PROBLEM-25======================
var bottle = function bottle() {
bottleName = 'Kinely';
this.bottleId = 12;
}

console.log('op1', bottle().bottleId)
console.log('op2', bottle().bottleName)

Ans-
Write the output in sequence ?
>
Thank u