JavaScript Questions & Answers – JavaScript Subsets | JavaScript MCQs

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Questions
1 The Crockford’s subset does not include which function in JavaScript?
A eval()
B coeval()
C equal()
D equivalent()

Answer: eval()
2 What does javascript use instead of == and !=?
A It uses bitwise checking
B It uses === and !== instead
C It uses equals() and notequals() instead
D It uses equalto()

Answer: It uses === and !== instead
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3 What is being imposed on each subset to ensure that it conforms to the subset?
A A parser to parse the code
B A parser that parses and adds to the subset
C A static verifier that parses code
D A predefined function to parse the code

Answer: A static verifier that parses code
4 Why was “The Good Parts” designed as a language subset in JavaScript?
A To improve programmer flexibility
B To balance the workload of the programmer
C To create an in-built compiler and interpreter
D To improve programmer productivity

Answer: To improve programmer productivity
5 Which is the subset that is a secure container designed for the purpose of safely running untrusted JavaScript?
A Sandbox
B The Good Parts
C Both Sandbox and Good Parts
D Web browser

Answer: Sandbox
6 Why is this keyword not preferred in JavaScript?
A Highly memory consuming
B Functions should access the global objects
C Functions should not access the global objects
D Very inefficient to use

Answer: Functions should not access the global objects
7 Which are the two functions that are not allowed in any secure subset?
A evaluate() and restrict()
B eval() and the Function() constructor
C debugger() and test()
D eval() and debugger()

Answer: debugger() and test()
8 Which is the object that defines methods that allow complete control over page content?
A The client-side document object
B The server-side document object
C Both client-side and server-side document object
D Web document object

Answer: The client-side document object
9 Which was one of the first security subsets proposed?
A FBJS
B Caja
C dojox.secure
D ADSafe

Answer: ADSafe
10 Which is the subset that transforms web content into secure modules that can be safely hosted on a web page?
A Microsoft Web Sandbox
B ADsafe
C Caja
D dojox.secure

Answer: dojox.secure
11 What will be the output of the following JavaScript code?
var set = new Set();  
set.add("one");  
set.add("two");    
for (let elements of set) 
{  
    document.writeln(elements+" ");  
}
A one
B two
C one two
D undefined

Answer: one two
12 What will be the output of the following JavaScript code?
set.add("AngularJS");  
set.add("Bootstrap");    
set.delete("Bootstrap");  
document.writeln(set.size);
A 2
B 1
C 0
D Undefined

Answer: 1
13 What will be the output of the following JavaScript code?
set.add("one");  
set.add("two");  
set.add("three");    
set.clear();  
document.writeln(set.size);
A one
B 1
C 2
D 0

Answer: 0
14 What will be the output of the following JavaScript code?
set.add("one");  
set.add("two”);
var itr=set.values();  
document.writeln(itr.next().value);
A one
B two
C error
D undefined

Answer: one
15 What will be the output of the following JavaScript code?
set.add("1");  
set.add("2");    
document.writeln(set.has("3"));
            
A 3
B true
C false
D 2

Answer: false

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