Do functions in JavaScript necessarily return a value ?

Do functions in JavaScript necessarily return a value ?

It is mandatory

Not necessary

Few functions return values by default

All of the mentioned

Answer : C

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1) Consider the following code snippet :

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

The output for the above statement would be :

10*10+5

105 as a string

105 as an integer value

Exception is thrown

2) Consider the following code snippet :

 var c = counter(), d = counter();
  c.count()
 d.count()
  c.reset()
  c.count()
  d.count()

The state stored in d is :

Null

Undefined

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3) Which is an equivalent code to invoke a function m of class o that expects two arguments x and y?

o(x,y);

o.m(x) && o.m(y);

m(x,y);

o.m(x,y);

4) What is the difference between the two lines given below ?

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

Both the lines result in a boolean value “True”

Both the lines result in a boolean value “False”

Both the lines checks just for the existence of the object alone

The first line results in a real boolean value whereas the second line merely checks for the existence of the objects

5) Consider the following code snippet :

var tensquared = (function(x)
 {
return x*x;
}
(10));

Will the above code work ?

Yes, perfectly

Error

Exception will be thrown

Memory leak

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