Multiple Choice Questions and Answers for Javascript

Questions

1 The functions provide() and require() of Dojo toolkit and Google’s Closure library are used for ___________

A declaring and loading modules

B declaring functions

C declaring modules

D loading modules

View Answer

Answer: declaring and loading modules

2 The maximum number of global symbols a module can define is ____________

A 2

B 3

C 1

D 4

View Answer

Answer: 1

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3 To define each of the set classes as a property of the sets object (namespace) for the module, the statement is

A sets = sets.AbstractEnumerableSet.extend();

B sets.SingletonSet = sets.AbstractEnumerableSet.extend(…);

C sets.SingletonSet = sets.extend(…);

D sets = sets.extend(…);

View Answer

Answer: sets.SingletonSet = sets.AbstractEnumerableSet.extend(…);

4 What will be the efficiency quotient of the following JavaScript statements?

var Set = sets.Set;
var s = new Set(1,2,3);

A The programmer imports at once the frequently used values into the global namespace

B There is no efficiency quotient, the programmer tries to make it inefficient

C The programmer needs to import the Sets everytime he wants to use it

D the programmer imports the set everytime the statement is encountered

View Answer

Answer: The programmer imports at once the frequently used values into the global namespace

5 The scope of a function is also called as ________

A Predefined function

B Module function

C Public function

D Private function

View Answer

Answer: Module function

6 Modules that have more than one item in their API can ________

A Assign itself to a global variable

B Invoke another module of the same kind

C Return a namespace object

D Invoke another module of the same kind

View Answer

Answer: Return a namespace object

7 The provides() function and the exportsobject are used to _________

A Register the module’s API and Store their API

B Call the modules api

C Store the module’s API

D Register the modules api

View Answer

Answer: Register the module’s API and Store their API

8 What could be achieved by running the JavaScript code snippet below?

var sets = com.davidflanagan.collections.sets;

A Importing a single module

B Importing a module partially

C Importing a namespace

D Importing the entire module

View Answer

Answer: Importing the entire module

9 The properties() method is a ________

A Enumerable method

B Non-enumerable method

C Operational method

D calling method

View Answer

Answer: Non-enumerable method

10 What can be done in order to avoid the creation of global variables in JavaScript?

A To use a method that defines all the variables

B To use an object that has the reference to all the variables

C To use an object as its namespace

D To use global functions

View Answer

Answer: To use an object as its namespace

11 What will be the output of the following JavaScript code? Modules in JavaScript

A 0.0123

B 12300

C Error

D Undefined

View Answer

Answer: 12300

12 What will be the output of the following JavaScript code?

Modules in JavaScript

A 3

B true

C false

D error

View Answer

Answer: true

13 What will be the output of the following JavaScript code?

Modules in JavaScript

A 3

B true

C false

D error

View Answer

Answer: false

14 What will be the output of the following JavaScript code?

Modules in JavaScript

A True

B False

C Error

D Undefined

View Answer

Answer: False

15 What will be the output of the following JavaScript code?

Modules in JavaScript

A true

B false

C error

D undefined

View Answer

Answer: false

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