JavaScript Questions & Answers – Modules in JavaScript

This set of Javascript Multiple Choice Questions & Answers (MCQs) focuses on “Modules in JavaScript”.

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
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2. The maximum number of global symbols a module can define is ____________
a) 2
b) 3
c) 1
d) 4
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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

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
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5. The scope of a function is also called as ________
a) Predefined function
b) Module function
c) Public function
d) Private function
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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
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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
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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
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9. The properties() method is a ________
a) Enumerable method
b) Non-enumerable method
c) Operational method
d) calling method
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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
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11. What will be the output of the following JavaScript code?

<p id="demo"></p>
<script>
var x = 123e5;
document.getElementById("demo").innerHTML = x ;
</script>

a) 0.0123
b) 12300
c) Error
d) Undefined
View Answer

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

<p id="demo"></p>
 <script>
function myFunction() 
{
   var res = "";
   res = res + Number.isFinite(5-2) ;
   document.getElementById("demo").innerHTML = res;
}
</script>

a) 3
b) true
c) false
d) error
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13. What will be the output of the following JavaScript code?

<p id="demo"></p>
 <script>
function myFunction() 
{
   var res = "";
   res = res + Number.isFinite(0 / 0);
   document.getElementById("demo").innerHTML = res;
}
</script>

a) 3
b) true
c) false
d) error
View Answer

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

<p id="demo"></p>
<script>
function myFunction() 
{
   var res = "";
   res = res + Number.isInteger('123');
   document.getElementById("demo").innerHTML = res;
}
</script>

a) True
b) False
c) Error
d) Undefined
View Answer

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

<p id="demo"></p>
<script>
function myFunction() 
{
   var res = "";
   res = res + Number.isInteger(0.5) + ": 0.5<br>";
   document.getElementById("demo").innerHTML = res;
}
</script>

a) true
b) false
c) error
d) undefined
View Answer

Sanfoundry Global Education & Learning Series – Javascript Programming.

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