JavaScript 1000+ MCQ with answer for RRB Group D

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

var arr=[1,2,3];
var rev=arr.reverse();
document.writeln(rev);

var o = new Object();

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

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

switch(expression)
{
statements
}

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

var string2Num=parseInt(123xyz);

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);

Int a=1;
if(a>10)
{
document.write(10);
}
else
{
document.write(a);
}

var grand_Total=eval(10*10+5);

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

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

var count = [1,,3];

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

const object1 = {};
a = Symbol('a');
b = Symbol.for('b');
object1[a] = 'harry';
object1[b] = 'derry';
const objectSymbols = Object.getOwnPropertySymbols(object1);
console.log(objectSymbols.length);

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

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

function compare()
{
int a=1;
char b=1;
if(a.tostring()===b)
return true;
else
return false;
}

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

!!(obj1 && obj2);
(obj1 && obj2);

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