Array And Function MCQ question and answer in javascript with solution Page-6 section-1

26.

What is the difference between the two lines given below ?

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

A. Both the lines result in a boolean value “True”

B. Both the lines result in a boolean value “False”

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

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

Answer & Solution Discuss in Board Save for Later

27.

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 :

A. 1

B. 0

C. Null

D. Undefined

Answer & Solution Discuss in Board Save for Later

28.

Consider the following code snippet :

var c = counter(), d = counter(); 
function constfuncs() 
{
    var funcs = [];
    for(var i = 0; i < 10; i++)
        funcs[i] = function() { return i; };
    return funcs;
}
var funcs = constfuncs();
funcs[5]()

What does the last statement return ?

A. 9

B. 0

C. 10

D. None of the mentioned

Answer & Solution Discuss in Board Save for Later

29.
What kind of scoping does JavaScript use?

A. Literal

B. Lexical

C. Segmental

D. Sequential

Answer & Solution Discuss in Board Save for Later

30.
What must be done in order to implement Lexical Scoping?

A. Get the object

B. Dereference the current scope chain

C. Reference the current scope chain

D. None of the mentioned

Answer & Solution Discuss in Board Save for Later

1 2 3 4 5 6 7 8

26.
What is the difference between the two lines given below ?
`!!(obj1 && obj2); (obj1 && obj2);`

Answer & Solution

27.
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 :

Answer & Solution

28.
Consider the following code snippet :
`var c = counter(), d = counter(); function constfuncs() { var funcs = []; for(var i = 0; i < 10; i++) funcs[i] = function() { return i; }; return funcs; } var funcs = constfuncs(); funcs[5]()`
What does the last statement return ?

Answer & Solution

29.
What kind of scoping does JavaScript use?

Answer & Solution

30.
What must be done in order to implement Lexical Scoping?

Answer & Solution

Array And Function MCQ question and answer in javascript with solution

26. What is the difference between the two lines given below ? !!(obj1 && obj2); (obj1 && obj2);

Answer & Solution

27. 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 :

Answer & Solution

28. Consider the following code snippet : var c = counter(), d = counter(); function constfuncs() { var funcs = []; for(var i = 0; i < 10; i++) funcs[i] = function() { return i; }; return funcs; } var funcs = constfuncs(); funcs[5]() What does the last statement return ?

Answer & Solution

29. What kind of scoping does JavaScript use?

Answer & Solution

30. What must be done in order to implement Lexical Scoping?

Answer & Solution

26.
What is the difference between the two lines given below ?
`!!(obj1 && obj2); (obj1 && obj2);`

27.
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 :

28.
Consider the following code snippet :
`var c = counter(), d = counter(); function constfuncs() { var funcs = []; for(var i = 0; i < 10; i++) funcs[i] = function() { return i; }; return funcs; } var funcs = constfuncs(); funcs[5]()`
What does the last statement return ?

29.
What kind of scoping does JavaScript use?

30.
What must be done in order to implement Lexical Scoping?