Javascript MCQs - CSE MCQs Questions and Answers

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What is the fundamental rule of lexical scoping?

Functions are declared in the scope

Functions are executed using scope chain

Both a and b

None of the mentioned

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

It returns the value 0

It will throw an exception

It returns the undefined value

None of the mentioned

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Consider the following statements

var text = "testing: 1, 2, 3"; // Sample text

var pattern = /\d+/g // Matches all instances of one or more digits

In order to check if the pattern matches with the string "text, the statement is

text==pattern

text.equals(pattern)

text.test(pattern)

pattern.test(text)

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For the below mentioned code snippet:

var o = new Object();

The equivalent statement is:

var o = Object();

var o;

var o= new Object;

Object o=new Object();

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JavaScript Code can be called by using

RMI

Triggering Event

Preprocessor

Function/Method

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One of the special feature of an interpreter in reference with the for loop is that

Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property

The iterations can be infinite when an interpreter is used

The body of the loop is executed only once

All of the mentioned

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Consider the following code snippet

function f(o)

{

if (o === undefined) debugger;

}

What could be the task of the statement debugger?

It does nothing but a simple breakpoint

It debugs the error in that statement and restarts the statement's execution

It is used as a keyword that debugs the entire program at once

All of the mentioned

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Consider the below given syntax

book[datatype]=assignment_value;

In the above syntax, the datatype within the square brackets must be

An integer

A String

An object

None of the mentioned