JavaScript Multiple Choice Questions (MCQ) Online Test #19

JavaScript MCQ #181:

What is the purpose of the eval() function in JavaScript?

To execute a string of JavaScript code

To evaluate a mathematical expression

To convert a string to a number

To validate user input

About JavaScript Multiple Choice Question (MCQ) #181:
This ICT Multiple Choice Question (ICT MCQ) #181 focuses on JavaScript within the "Intermediate ICT MCQ" category. This question tests the understanding of the purpose of the eval() function in JavaScript.

JavaScript MCQ #182:

How do you create a new promise in JavaScript?

var myPromise = new Promise();

var myPromise = new Promise(function(resolve, reject) { });

var myPromise = Promise.new();

var myPromise = create Promise();

About JavaScript Multiple Choice Question (MCQ) #182:
This ICT Multiple Choice Question (ICT MCQ) #182 focuses on JavaScript within the "Intermediate ICT MCQ" category. This question tests the understanding of how to create a new promise in JavaScript.

JavaScript MCQ #183:

What does the reduce() method do in JavaScript?

It applies a function against an accumulator and each element to reduce it to a single value

It removes elements from an array

It creates a new array with all elements that pass the test implemented by the provided function

It adds elements to the end of an array

About JavaScript Multiple Choice Question (MCQ) #183:
This ICT Multiple Choice Question (ICT MCQ) #183 focuses on JavaScript within the "Intermediate ICT MCQ" category. This question tests the understanding of what the reduce() method does in JavaScript.

JavaScript MCQ #184:

How do you handle exceptions in JavaScript?

try { } catch { }

catch (error) { }

try { } catch (error) { }

handle { } catch { }

About JavaScript Multiple Choice Question (MCQ) #184:
This ICT Multiple Choice Question (ICT MCQ) #184 focuses on JavaScript within the "Intermediate ICT MCQ" category. This question tests the understanding of how to handle exceptions in JavaScript.

JavaScript MCQ #185:

What is the result of typeof NaN in JavaScript?

NaN

number

undefined

object

About JavaScript Multiple Choice Question (MCQ) #185:
This ICT Multiple Choice Question (ICT MCQ) #185 focuses on JavaScript within the "Intermediate ICT MCQ" category. This question tests the understanding of the result of typeof NaN in JavaScript.

JavaScript MCQ #186:

What does the setTimeout() function do in JavaScript?

Executes a function repeatedly with a fixed time delay between each call

Executes a function after a specified delay

Stops the execution of a function

Immediately executes a function

About JavaScript Multiple Choice Question (MCQ) #186:
This ICT Multiple Choice Question (ICT MCQ) #186 focuses on JavaScript within the "Intermediate ICT MCQ" category. This question tests the understanding of what the setTimeout() function does in JavaScript.

JavaScript MCQ #187:

How do you concatenate two strings in JavaScript?

string1.concat(string2)

string1 + string2

string1.append(string2)

string1.merge(string2)

About JavaScript Multiple Choice Question (MCQ) #187:
This ICT Multiple Choice Question (ICT MCQ) #187 focuses on JavaScript within the "Intermediate ICT MCQ" category. This question tests the understanding of how to concatenate two strings in JavaScript.

JavaScript MCQ #188:

What does the delete operator do in JavaScript?

Deletes an element from an array

Deletes a property from an object

Removes a variable from memory

Deletes a function

About JavaScript Multiple Choice Question (MCQ) #188:
This ICT Multiple Choice Question (ICT MCQ) #188 focuses on JavaScript within the "Intermediate ICT MCQ" category. This question tests the understanding of what the delete operator does in JavaScript.

JavaScript MCQ #189:

What does the call() method do in JavaScript?

It calls a method with a given this value and arguments provided individually

It invokes a function at a specified time interval

It creates a new instance of a function

It binds a function to an object

About JavaScript Multiple Choice Question (MCQ) #189:
This ICT Multiple Choice Question (ICT MCQ) #189 focuses on JavaScript within the "Intermediate ICT MCQ" category. This question tests the understanding of what the call() method does in JavaScript.

JavaScript MCQ #190:

What is the difference between == and === in JavaScript?

== checks for equality of value and type, while === checks for equality of value only

== checks for equality of value, while === checks for equality of value and type

There is no difference between == and ===

== is used for assignment, while === is used for comparison

About JavaScript Multiple Choice Question (MCQ) #190:
This ICT Multiple Choice Question (ICT MCQ) #190 focuses on JavaScript within the "Intermediate ICT MCQ" category. This question tests the understanding of the difference between == and === in JavaScript.

This page was last modified on Dec 30, 2024 by ICT MCQ Hub.

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JavaScript Multiple Choice Questions (MCQ) Online Test #19

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