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");

2) 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

3) 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

4) What is the purpose of a return statement in a function?

Returns the value and continues executing rest of the statements, if any

Returns the value and stops the program

Returns the value and stops executing the function

Stops executing the function and returns the value

5) For the below mentioned code snippet:

var o = new Object();

The equivalent statement is:

var o = Object();

var o;

var o= new Object;

Object o=new Object();

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