52 + Mcqs in Array And Function Page 1 McqOptions

1.	Consider the following code snippet :var scope = "global scope";function checkscope() {var scope = "local scope";function f(){return scope;}return f;What is the function of the above code snippet?
A.	eturns value null
B.	eturns exception
C.	eturns the value in scope
D.	one of the mentioned
Answer» D. one of the mentioned

Discussion

2.	Consider the following code snippetfunction hypotenuse(a, b){function square(x){return x*x;}return Math.sqrt(square(a) + square(b));}What does the above code result?
A.	um of square of a and b
B.	quare of sum of a and b
C.	um of a and b square
D.	one of the mentioned
Answer» B. quare of sum of a and b

Discussion

3.	Consider the following code snippetfunction printprops(o){for(var p in o)console.log(p + ": " + o[p] + "n");}What will the above code snippet result ?
A.	rints the contents of each property of o
B.	eturns undefined
C.	ll of the mentioned
D.	one of the mentioned
Answer» C. ll of the mentioned

Discussion

4.	Consider the following code snippetvar a1 = [,,,];var a2 = new Array(3);">0 in a10 in a2The result would be
A.	rue false
B.	alse true
C.	rue true
D.	alse true
Answer» B. alse true

Discussion

5.	Which of the algorithmic languages is lexical scoping standardized in?%!
A.	Ada
B.	Pascal
C.	Modula2
D.	All of the mentioned
Answer» E.

Discussion

6.	What is the purpose of the dynamic scoping?%!
A.	Variables can be declared outside the scope
B.	Variables must be declared outside the scope
C.	Variables cannot be declared outside the scope
D.	None of the mentioned
Answer» B. Variables must be declared outside the scope

Discussion

7.	What is the opposite approach to the lexical scoping?%!
A.	Literal scoping
B.	Static scoping
C.	Dynamic scoping
D.	Generic scoping
Answer» D. Generic scoping

Discussion

8.	What will happen if reverse() and join() methods are used simultaneously ?%!
A.	Reverses and stores in the same array
B.	Reverses and concatenates the elements of the array
C.	Reverses
D.	All of the mentioned
Answer» B. Reverses and concatenates the elements of the array

Discussion

9.	The method or operator used to identify the array is%!
A.	isarrayType()
B.	==
C.	===
D.	typeof
Answer» E.

Discussion

10.	What will happen if a return statement does not have an associated expression?%!
A.	It returns the value 0
B.	It will throw an exception
C.	It returns the undefined value
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

11.	Consider the following code snippet :var grand_Total=eval("10*10+5");The output for the above statement would be :%!
A.	10*10+5
B.	105 as a string
C.	105 as an integer value
D.	Exception is thrown
Answer» D. Exception is thrown

Discussion

12.	For the below mentioned code snippet:var o = new Object();The equivalent statement is:%!
A.	var o = Object();
B.	var o;
C.	var o= new Object;
D.	Object o=new Object();
Answer» D. Object o=new Object();

Discussion

13.	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» D. None of the mentioned

Discussion

14.	What is the fundamental rule of lexical scoping?%!
A.	Functions are declared in the scope
B.	Functions are executed using scope chain
C.	All of the mentioned
D.	None of the mentioned
Answer» C. All of the mentioned

Discussion

15.	*$_The method or operator used to identify the array is?
A.	isarrayType()
B.	==
C.	===
D.	typeof
Answer» E.

Discussion

16.	*$_What will happen if a return statement does not have an associated expression??
A.	It returns the value 0
B.	It will throw an exception
C.	It returns the undefined value
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

17.	*$_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» D. None of the mentioned

Discussion

18.	*$_What is the fundamental rule of lexical scoping??
A.	Functions are declared in the scope
B.	Functions are executed using scope chain
C.	All of the mentioned
D.	None of the mentioned
Answer» C. All of the mentioned

Discussion

19.	$_Consider the following code snippet :var grand_Total=eval("1010+5");The output for the above statement would be :?
A.	10*10+5
B.	105 as a string
C.	105 as an integer value
D.	Exception is thrown
Answer» D. Exception is thrown

Discussion

20.	*$_For the below mentioned code snippet:var o = new Object();The equivalent statement is:?
A.	var o = Object();
B.	var o;
C.	var o= new Object;
D.	Object o=new Object();
Answer» D. Object o=new Object();

Discussion

21.	/_What will happen if reverse() and join() methods are used simultaneously ??
A.	Reverses and stores in the same array
B.	Reverses and concatenates the elements of the array
C.	Reverses
D.	All of the mentioned
Answer» B. Reverses and concatenates the elements of the array

Discussion

22.	_ The reduce and reduceRight methods follow a common operation called$?
A.	filter and fold
B.	inject and fold
C.	finger and fold
D.	fold
Answer» C. finger and fold

Discussion

23.	_ What is the purpose of a return statement in a function?$?
A.	Returns the value and continues executing rest of the statements, if any
B.	Returns the value and stops the program
C.	Returns the value and stops executing the function
D.	Stops executing the function and returns the value
Answer» E.

Discussion

24.	_ What kind of scoping does JavaScript use?$?
A.	Literal
B.	Lexical
C.	Segmental
D.	Sequential
Answer» C. Segmental

Discussion

25.	_ Consider the following code snippet :var scope = "global scope";function checkscope() {var scope = "local scope"; function f() { return scope; }return f;What is the function of the above code snippet?$?
A.	Returns value null
B.	Returns exception
C.	Returns the value in scope
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

26.	_ Which is an equivalent code to invoke a function m of class o that expects two arguments x and y?$?
A.	o(x,y);
B.	o.m(x) && o.m(y);
C.	m(x,y);
D.	o.m(x,y);
Answer» E.

Discussion

27.	_ If you have a function f and an object o, you can define a method named m of o with$?
A.	o.m=m.f;
B.	o.m=f;
C.	o=f.m;
D.	o=f;
Answer» B. o.m=f;

Discussion

28.	_ Consider the following code snippet :if (!a[i]) continue ;What is the observation made ?$?
A.	Skips the undefined elements
B.	Skips the non existent elements
C.	Skips the null elements
D.	All of the mentioned
Answer» E.

Discussion

29.	_The primary purpose of the array map() function is that it$?
A.	maps the elements of another array into itself
B.	passes each element of the array and returns the necessary mapped elements
C.	passes each element of the array on which it is invoked to the function you specify, and returns an array containing the values returned by that function
D.	None of the mentioned
Answer» D. None of the mentioned

Discussion

30.	_When does the function name become optional in JavaScript?$?
A.	When the function is defined as a looping statement
B.	When the function is defined as expressions
C.	When the function is predefined
D.	All of the mentioned
Answer» C. When the function is predefined

Discussion

31.	_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» D. None of the mentioned

Discussion

32.	_Which of the following uses a lot of CPU cycles?$?
A.	GUI
B.	Statically generated graphics
C.	Dynamically generated graphics
D.	All of the mentioned
Answer» D. All of the mentioned

Discussion

33.	_Which of the following is the correct code for invoking a function without this keyword at all, and also too determine whether the strict mode is in effect?$?
A.	var strict = (function { return this; });
B.	mode strict = (function() { return !this; }());
C.	var strict = (function() { return !this; }());
D.	mode strict = (function { });
Answer» D. mode strict = (function { });

Discussion

34.	_Consider the following code snippet :var string2Num=parseInt("123xyz");The result for the above code snippet would be :$?
A.	123
B.	123xyz
C.	Exception
D.	NaN
Answer» C. Exception

Discussion

35.	_The pop() method of the array does which of the following task ?$?
A.	decrements the total length by 1
B.	increments the total length by 1
C.	prints the first element but no effect on the length
D.	None of the mentioned
Answer» B. increments the total length by 1

Discussion

36.	Consider the following code snippet :var a = []; a.unshift(1); a.unshift(22);a.shift(); a.unshift(3,[4,5]); a.shift(); a.shift();a.shift();The final output for the shift() is$?
A.	1
B.	[4,5]
C.	[3,4,5]
D.	Exception is thrown
Answer» B. [4,5]

Discussion

37.	Consider the following code snippetfunction printprops(o) { for(var p in o) console.log(p + ": " + o[p] + "n");}What will the above code snippet result ?$?
A.	Prints the contents of each property of o
B.	Returns undefined
C.	All of the mentioned
D.	None of the mentioned
Answer» C. All of the mentioned

Discussion

38.	Consider the following code snippetfunction hypotenuse(a, b) { function square(x) { return x*x; } return Math.sqrt(square(a) + square(b));}What does the above code result?$?
A.	Sum of square of a and b
B.	Square of sum of a and b
C.	Sum of a and b square
D.	None of the mentioned
Answer» B. Square of sum of a and b

Discussion

39.	Consider the following code snippet :var tensquared = (function(x) {return x*x;}(10));Will the above code work ?$?
A.	Yes, perfectly
B.	Error
C.	Exception will be thrown
D.	Memory leak
Answer» B. Error

Discussion

40.	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» B. 0

Discussion

41.	Which of the following are examples of closures?$?
A.	Objects
B.	Variables
C.	Functions
D.	All of the mentioned
Answer» E.

Discussion

42.	Consider the following code snippet :var a = []; a.unshift(1); a.unshift(22);a.shift(); a.unshift(3,[4,5]); a.shift(); a.shift();a.shift();The final output for the shift() is?
A.	1
B.	[4,5]
C.	[3,4,5]
D.	Exception is thrown
Answer» B. [4,5]

Discussion

43.	Consider the following code snippetfunction printprops(o) { for(var p in o) console.log(p + ": " + o[p] + "n");}What will the above code snippet result ??
A.	Prints the contents of each property of o
B.	Returns undefined
C.	All of the mentioned
D.	None of the mentioned
Answer» C. All of the mentioned

Discussion

44.	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» B. 0

Discussion

45.	Which of the following are examples of closures??
A.	Objects
B.	Variables
C.	Functions
D.	All of the mentioned
Answer» E.

Discussion

46.	Consider the following code snippetfunction hypotenuse(a, b) { function square(x) { return x*x; } return Math.sqrt(square(a) + square(b));}What does the above code result??
A.	Sum of square of a and b
B.	Square of sum of a and b
C.	Sum of a and b square
D.	None of the mentioned
Answer» B. Square of sum of a and b

Discussion

47.	Consider the following code snippet :var tensquared = (function(x) {return x*x;}(10));Will the above code work ??
A.	Yes, perfectly
B.	Error
C.	Exception will be thrown
D.	Memory leak
Answer» B. Error

Discussion

48.	Consider the following code snippetvar a1 = [,,,]; var a2 = new Array(3); ">0 in a1 0 in a2The result would be
A.	true false
B.	false true
C.	true true
D.	false true
Answer» B. false true

Discussion

49.	Consider the following code snippet :var a = [1,2,3,4,5];a.slice(0,3);What is the possible output for the above code snippet ?
A.	Returns [1,2,3]
B.	Returns [4,5]
C.	Returns [1,2,3,4]
D.	Returns [1,2,3,4,5]
Answer» B. Returns [4,5]

Discussion

50.	What is the difference between the two lines given below ?!!(obj1 && obj2);(obj1 && obj2);
A.	Both the lines result in a boolean value ‚Äö√Ñ√∫True‚Äö√Ñ√π
B.	Both the lines result in a boolean value ‚Äö√Ñ√∫False‚Äö√Ñ√π
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» E.

Discussion

Explore topic-wise MCQs in Javascript.

Consider the following code snippet :var scope = "global scope";function checkscope() {var scope = "local scope";function f(){return scope;}return f;What is the function of the above code snippet?

Consider the following code snippetfunction hypotenuse(a, b){function square(x){return x*x;}return Math.sqrt(square(a) + square(b));}What does the above code result?

Consider the following code snippetfunction printprops(o){for(var p in o)console.log(p + ": " + o[p] + "n");}What will the above code snippet result ?

Consider the following code snippetvar a1 = [,,,];var a2 = new Array(3);">0 in a10 in a2The result would be

Which of the algorithmic languages is lexical scoping standardized in?%!

What is the purpose of the dynamic scoping?%!

What is the opposite approach to the lexical scoping?%!

What will happen if reverse() and join() methods are used simultaneously ?%!

The method or operator used to identify the array is%!

What will happen if a return statement does not have an associated expression?%!

Consider the following code snippet :var grand_Total=eval("10*10+5");The output for the above statement would be :%!

For the below mentioned code snippet:var o = new Object();The equivalent statement is:%!

What must be done in order to implement Lexical Scoping?%!

What is the fundamental rule of lexical scoping?%!

*$_The method or operator used to identify the array is?

*$_What will happen if a return statement does not have an associated expression??

*$_What must be done in order to implement Lexical Scoping??

*$_What is the fundamental rule of lexical scoping??

*$_Consider the following code snippet :var grand_Total=eval("10*10+5");The output for the above statement would be :?

*$_For the below mentioned code snippet:var o = new Object();The equivalent statement is:?

*/*_What will happen if reverse() and join() methods are used simultaneously ??

_ The reduce and reduceRight methods follow a common operation called$?

_ What is the purpose of a return statement in a function?$?

_ What kind of scoping does JavaScript use?$?

_ Consider the following code snippet :var scope = "global scope";function checkscope() {var scope = "local scope"; function f() { return scope; }return f;What is the function of the above code snippet?$?

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

_ If you have a function f and an object o, you can define a method named m of o with$?

_ Consider the following code snippet :if (!a[i]) continue ;What is the observation made ?$?

_The primary purpose of the array map() function is that it$?

_When does the function name become optional in JavaScript?$?

_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 ?$?

_Which of the following uses a lot of CPU cycles?$?

_Which of the following is the correct code for invoking a function without this keyword at all, and also too determine whether the strict mode is in effect?$?

_Consider the following code snippet :var string2Num=parseInt("123xyz");The result for the above code snippet would be :$?

_The pop() method of the array does which of the following task ?$?

Consider the following code snippet :var a = []; a.unshift(1); a.unshift(22);a.shift(); a.unshift(3,[4,5]); a.shift(); a.shift();a.shift();The final output for the shift() is$?

Consider the following code snippetfunction printprops(o) { for(var p in o) console.log(p + ": " + o[p] + "n");}What will the above code snippet result ?$?

Consider the following code snippetfunction hypotenuse(a, b) { function square(x) { return x*x; } return Math.sqrt(square(a) + square(b));}What does the above code result?$?

Consider the following code snippet :var tensquared = (function(x) {return x*x;}(10));Will the above code work ?$?

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 :$?

Which of the following are examples of closures?$?

Consider the following code snippet :var a = []; a.unshift(1); a.unshift(22);a.shift(); a.unshift(3,[4,5]); a.shift(); a.shift();a.shift();The final output for the shift() is?

Consider the following code snippetfunction printprops(o) { for(var p in o) console.log(p + ": " + o[p] + "n");}What will the above code snippet result ??

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 :?

Which of the following are examples of closures??

Consider the following code snippetfunction hypotenuse(a, b) { function square(x) { return x*x; } return Math.sqrt(square(a) + square(b));}What does the above code result??

Consider the following code snippet :var tensquared = (function(x) {return x*x;}(10));Will the above code work ??

Consider the following code snippetvar a1 = [,,,]; var a2 = new Array(3); ">0 in a1 0 in a2The result would be

Consider the following code snippet :var a = [1,2,3,4,5];a.slice(0,3);What is the possible output for the above code snippet ?

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

$_Consider the following code snippet :var grand_Total=eval("1010+5");The output for the above statement would be :?

/_What will happen if reverse() and join() methods are used simultaneously ??