UPSC IES - JavaScript 1000+ MCQ [Solved] PDF Download

const obj = {prop: 12};
Object.preventExtensions(obj);
console.log( Object.isExtensible(obj));

var a1 = [,,,];
var a2 = new Array(3);
0 in a1
0 in a2

function info()
{
int a=1;
int b=2;
return a*b;
}
document.write(info());

var grade='B';
var result;
switch(grade)
{
case 'A':
{
result+=10;
break;
}
case 'B':
{
result+= 9;
break;
}
case 'C':
{
result+= 8;
break;
}
default:
result+= 0;
}
document.write(result);

var count = 0;
while (count < 10)
{
console.log(count);
count++;
}

for(var num=10;num>=1;num--)
{
document.writeln(num);
}

var num=10;
while(num>=1)
{
document.writeln(num);
num++;
}

while (a != 0)
{
if (a == 1)
continue;
else
a++;
}

var a = 10;
do {
a += 1;
console.log(a);
} while (a < 5);

string a = hi;
string b =there;
alert(a+b);

function f(o)
{
if (o === undefined) debugger;
}

<script>
txt1 = “ one”;
txt1 += “two”;
document.getElementById("demo").innerHTML = txt1;
</script>

for(var p in o)
console.log(o[p]);

int a=4;
int b=1;
int c=0;
If(a==b)
document.write(a);
else if(a==c)
document.write(a);
else
document.write(c);

int a==2;
int b=4;
int ans=a+b;
print(ans);

function output(option)
{
return (option ? yes : no);
}
bool ans=true;
console.log(output(ans));

var a = [1,2,3,4,5];
a.slice(0,3);

var a=5 , b=1
var obj = { a : 10 }
with(obj)
{
alert(b)
}

var grade='E';
var result;
switch(grade)
{
case 'A':
result+=10;
case 'B':
result+= 9;
case 'C':
result+= 8;
default:
result+= 0;
}
document.write(result);

int a=4;
int b=1;
int c=0;
If(a==b)
document.write(a);
else if(a==c)
document.write(a);
else
document.write(c);

function equalto()
{
int num=10;
if(num===10)
return true;
else
return false;
}

var obj=
{
length:20,
height:35,
}
if (breadth' in obj === false)
{
obj.breadth = 12;
}
console.log(obj.breadth);

function output(object)
{
var place=object ? object.place : Italy;
return clean:+ place;
}
console.log(output({place:India}));

<script>
document.getElementById("demo").innerHTML = typeof "John"
</script>

var grade='A';
var result;
switch(grade)
{
case 'A':
result+=10;
case 'B':
result+= 9;
case 'C':
result+= 8;
default:
result+= 0;
}
document.write(result);

function f() {};