LEARN JAVASCRIPT
🔥Mastering JavaScript Objects - A
Practical Guide! 🚀🖥️
Quiz JavaScript Objects!
Question: How do you create an object in JavaScript? 2
Question: How do you access the properties of an object? 3
Question: How do you add a new property to an existing object? 3
Question: How do you delete a property from an object? 4
Question: How do you check if an object contains a specific property? 4
Question: How can you iterate over the properties of an object? 5
Question: How do you create a copy of an object? 5
Question: How do you merge two objects? 6
Question: How do you find the number of properties in an object? 6
Question: How do you prevent modifications to an object? 7
Below are coding questions and answers focused on JavaScript Objects. Whether
you're honing your skills or diving into JavaScript for the first time, these exercises
are designed to enhance your understanding of objects in JS, a key concept in the
language. 👩‍💻👨‍💻
We explore a variety of topics including:
● Object Creation
● Property Access
Learn more about JavaScript with Examples and Source Code Laurence Svekis
Courses https://basescripts.com/
1
● Adding Properties
● Deleting Properties
● Property Existence Check
● Property Iteration
● Object Copying
● Object Merging
● Counting Properties
● Object Immutability
Each question is accompanied by a solution and a detailed explanation, ensuring a
robust learning experience. 📘💡
Question: How do you create an object in JavaScript?
Answer:
Objects can be created using curly braces {}.
Example:
let person = {
name: 'Alice',
age: 25,
occupation: 'Developer'
};
Learn more about JavaScript with Examples and Source Code Laurence Svekis
Courses https://basescripts.com/
2
Explanation: This syntax creates an object person with properties name, age, and
occupation.
Question: How do you access the properties of an
object?
Answer:
Properties can be accessed using dot notation or bracket notation.
Example:
console.log(person.name); // Output: Alice
console.log(person['age']); // Output: 25
Explanation: Dot notation is more succinct, while bracket notation is useful when
property names are dynamic or not valid identifiers.
Question: How do you add a new property to an existing
object?
Answer:
Add a property using dot notation or bracket notation.
Example:
person.country = 'USA';
person['email'] = 'alice@example.com';
Learn more about JavaScript with Examples and Source Code Laurence Svekis
Courses https://basescripts.com/
3
console.log(person);
Explanation: This adds country and email properties to the person object.
Question: How do you delete a property from an object?
Answer:
Use the delete operator to remove a property.
Example:
delete person.occupation;
console.log(person);
Explanation: This removes the occupation property from the person object.
Question: How do you check if an object contains a
specific property?
Answer:
Use the in operator or hasOwnProperty method.
Example:
console.log('name' in person); // Output: true
console.log(person.hasOwnProperty('age')); // Output: true
Explanation: Both methods check for the existence of a property in an object.
Learn more about JavaScript with Examples and Source Code Laurence Svekis
Courses https://basescripts.com/
4
Question: How can you iterate over the properties of an
object?
Answer:
Use a for...in loop to iterate over object properties.
Example:
for (let key in person) {
console.log(key + ': ' + person[key]);
}
Explanation: The loop iterates over each enumerable property of the object.
Question: How do you create a copy of an object?
Answer:
Use Object.assign or spread syntax {...} to create a shallow copy.
Example with Object.assign:
let personCopy = Object.assign({}, person);
console.log(personCopy);
Explanation: Object.assign copies properties from one or more source objects to a
target object.
Learn more about JavaScript with Examples and Source Code Laurence Svekis
Courses https://basescripts.com/
5
Question: How do you merge two objects?
Answer:
Merge objects using Object.assign or spread syntax.
Example with spread syntax:
let additionalInfo = { gender: 'female', city: 'New York' };
let mergedPerson = {...person, ...additionalInfo};
console.log(mergedPerson);
Explanation: Spread syntax is used to combine the properties of person and
additionalInfo into mergedPerson.
Question: How do you find the number of properties in
an object?
Answer:
Use Object.keys() to get an array of properties and then find its length.
Example:
console.log(Object.keys(person).length); // Output: Number of properties
Explanation: Object.keys() returns an array of a given object's property names.
Learn more about JavaScript with Examples and Source Code Laurence Svekis
Courses https://basescripts.com/
6
Question: How do you prevent modifications to an
object?
Answer:
Use Object.freeze() to make an object immutable.
Example:
Object.freeze(person);
person.age = 30; // This will not change the age property
console.log(person);
Explanation: After freezing, no new properties can be added, existing properties
cannot be removed or changed.
Learn more about JavaScript with Examples and Source Code Laurence Svekis
Courses https://basescripts.com/
7

More Related Content

PPTX
Javascript Objects Deep Dive
PPTX
Understanding-Objects-in-Javascript.pptx
PPTX
13_User_Defined_Objects.pptx objects in javascript
PPTX
Javascript Objects and Functions
PPTX
Javascript Objects and Functions
PPTX
Cordova training : Day 4 - Advanced Javascript
PPTX
Java script
PPT
Intermediate JavaScript
Javascript Objects Deep Dive
Understanding-Objects-in-Javascript.pptx
13_User_Defined_Objects.pptx objects in javascript
Javascript Objects and Functions
Javascript Objects and Functions
Cordova training : Day 4 - Advanced Javascript
Java script
Intermediate JavaScript

Similar to Quiz JavaScript Objects Learn more about JavaScript (20)

PDF
L7. Object in JS, CSE 202, BN11.pdf JavaScript
PPTX
Object oriented javascript
PPTX
JavaScript OOPS Implimentation
PDF
JavaScript 1.8.5: New Features Explored
PDF
JavaScript Object API
PPTX
Object oriented javascript
PPTX
Web Host_G4.pptx
PDF
JavaScript(Es5) Interview Questions & Answers
PPT
Beginning Object-Oriented JavaScript
PPTX
Javascript
PDF
javascript objects
PPTX
Object Oriented Programming In JavaScript
PPTX
IWT presentation121232112122222225556+556.pptx
PPTX
Javascript analysis
PDF
Javascript
PDF
Java script
PDF
Intro to JavaScript - Week 4: Object and Array
PPTX
Object Oriented Javascript part2
PDF
27javascript
PDF
Object Oriented Javascript
L7. Object in JS, CSE 202, BN11.pdf JavaScript
Object oriented javascript
JavaScript OOPS Implimentation
JavaScript 1.8.5: New Features Explored
JavaScript Object API
Object oriented javascript
Web Host_G4.pptx
JavaScript(Es5) Interview Questions & Answers
Beginning Object-Oriented JavaScript
Javascript
javascript objects
Object Oriented Programming In JavaScript
IWT presentation121232112122222225556+556.pptx
Javascript analysis
Javascript
Java script
Intro to JavaScript - Week 4: Object and Array
Object Oriented Javascript part2
27javascript
Object Oriented Javascript
Ad

More from Laurence Svekis ✔ (20)

PDF
JavaScript Lessons 2023 V2
PDF
JavaScript Lessons 2023
PDF
Top 10 Linkedin Tips Guide 2023
PDF
JavaScript Interview Questions 2023
PDF
Code examples javascript ebook
PDF
Javascript projects Course
PDF
10 java script projects full source code
PDF
Chrome DevTools Introduction 2020 Web Developers Guide
PDF
Brackets code editor guide
PDF
Web hosting get start online
PDF
JavaScript guide 2020 Learn JavaScript
PDF
Web hosting Free Hosting
PDF
Web development resources brackets
PPTX
Google Apps Script for Beginners- Amazing Things with Code
PPTX
Local SQLite Database with Node for beginners
PDF
Introduction to Node js for beginners + game project
PPTX
JavaScript DOM - Dynamic interactive Code
PPTX
JavaScript Advanced - Useful methods to power up your code
PPTX
Monster JavaScript Course - 50+ projects and applications
PPTX
JavaScript Objects and OOP Programming with JavaScript
JavaScript Lessons 2023 V2
JavaScript Lessons 2023
Top 10 Linkedin Tips Guide 2023
JavaScript Interview Questions 2023
Code examples javascript ebook
Javascript projects Course
10 java script projects full source code
Chrome DevTools Introduction 2020 Web Developers Guide
Brackets code editor guide
Web hosting get start online
JavaScript guide 2020 Learn JavaScript
Web hosting Free Hosting
Web development resources brackets
Google Apps Script for Beginners- Amazing Things with Code
Local SQLite Database with Node for beginners
Introduction to Node js for beginners + game project
JavaScript DOM - Dynamic interactive Code
JavaScript Advanced - Useful methods to power up your code
Monster JavaScript Course - 50+ projects and applications
JavaScript Objects and OOP Programming with JavaScript
Ad

Recently uploaded (20)

PDF
Dell Pro Micro: Speed customer interactions, patient processing, and learning...
PDF
The-Future-of-Automotive-Quality-is-Here-AI-Driven-Engineering.pdf
PDF
Improvisation in detection of pomegranate leaf disease using transfer learni...
PDF
“A New Era of 3D Sensing: Transforming Industries and Creating Opportunities,...
PDF
How ambidextrous entrepreneurial leaders react to the artificial intelligence...
PPTX
Configure Apache Mutual Authentication
PDF
5-Ways-AI-is-Revolutionizing-Telecom-Quality-Engineering.pdf
PDF
NewMind AI Weekly Chronicles – August ’25 Week IV
PDF
giants, standing on the shoulders of - by Daniel Stenberg
PDF
Transform-Quality-Engineering-with-AI-A-60-Day-Blueprint-for-Digital-Success.pdf
PDF
sbt 2.0: go big (Scala Days 2025 edition)
PDF
Flame analysis and combustion estimation using large language and vision assi...
DOCX
search engine optimization ppt fir known well about this
PDF
Taming the Chaos: How to Turn Unstructured Data into Decisions
PPTX
Custom Battery Pack Design Considerations for Performance and Safety
PDF
The influence of sentiment analysis in enhancing early warning system model f...
PDF
Convolutional neural network based encoder-decoder for efficient real-time ob...
PPT
Geologic Time for studying geology for geologist
PDF
4 layer Arch & Reference Arch of IoT.pdf
PDF
Produktkatalog für HOBO Datenlogger, Wetterstationen, Sensoren, Software und ...
Dell Pro Micro: Speed customer interactions, patient processing, and learning...
The-Future-of-Automotive-Quality-is-Here-AI-Driven-Engineering.pdf
Improvisation in detection of pomegranate leaf disease using transfer learni...
“A New Era of 3D Sensing: Transforming Industries and Creating Opportunities,...
How ambidextrous entrepreneurial leaders react to the artificial intelligence...
Configure Apache Mutual Authentication
5-Ways-AI-is-Revolutionizing-Telecom-Quality-Engineering.pdf
NewMind AI Weekly Chronicles – August ’25 Week IV
giants, standing on the shoulders of - by Daniel Stenberg
Transform-Quality-Engineering-with-AI-A-60-Day-Blueprint-for-Digital-Success.pdf
sbt 2.0: go big (Scala Days 2025 edition)
Flame analysis and combustion estimation using large language and vision assi...
search engine optimization ppt fir known well about this
Taming the Chaos: How to Turn Unstructured Data into Decisions
Custom Battery Pack Design Considerations for Performance and Safety
The influence of sentiment analysis in enhancing early warning system model f...
Convolutional neural network based encoder-decoder for efficient real-time ob...
Geologic Time for studying geology for geologist
4 layer Arch & Reference Arch of IoT.pdf
Produktkatalog für HOBO Datenlogger, Wetterstationen, Sensoren, Software und ...

Quiz JavaScript Objects Learn more about JavaScript

  • 1. LEARN JAVASCRIPT 🔥Mastering JavaScript Objects - A Practical Guide! 🚀🖥️ Quiz JavaScript Objects! Question: How do you create an object in JavaScript? 2 Question: How do you access the properties of an object? 3 Question: How do you add a new property to an existing object? 3 Question: How do you delete a property from an object? 4 Question: How do you check if an object contains a specific property? 4 Question: How can you iterate over the properties of an object? 5 Question: How do you create a copy of an object? 5 Question: How do you merge two objects? 6 Question: How do you find the number of properties in an object? 6 Question: How do you prevent modifications to an object? 7 Below are coding questions and answers focused on JavaScript Objects. Whether you're honing your skills or diving into JavaScript for the first time, these exercises are designed to enhance your understanding of objects in JS, a key concept in the language. 👩‍💻👨‍💻 We explore a variety of topics including: ● Object Creation ● Property Access Learn more about JavaScript with Examples and Source Code Laurence Svekis Courses https://basescripts.com/ 1
  • 2. ● Adding Properties ● Deleting Properties ● Property Existence Check ● Property Iteration ● Object Copying ● Object Merging ● Counting Properties ● Object Immutability Each question is accompanied by a solution and a detailed explanation, ensuring a robust learning experience. 📘💡 Question: How do you create an object in JavaScript? Answer: Objects can be created using curly braces {}. Example: let person = { name: 'Alice', age: 25, occupation: 'Developer' }; Learn more about JavaScript with Examples and Source Code Laurence Svekis Courses https://basescripts.com/ 2
  • 3. Explanation: This syntax creates an object person with properties name, age, and occupation. Question: How do you access the properties of an object? Answer: Properties can be accessed using dot notation or bracket notation. Example: console.log(person.name); // Output: Alice console.log(person['age']); // Output: 25 Explanation: Dot notation is more succinct, while bracket notation is useful when property names are dynamic or not valid identifiers. Question: How do you add a new property to an existing object? Answer: Add a property using dot notation or bracket notation. Example: person.country = 'USA'; person['email'] = '[email protected]'; Learn more about JavaScript with Examples and Source Code Laurence Svekis Courses https://basescripts.com/ 3
  • 4. console.log(person); Explanation: This adds country and email properties to the person object. Question: How do you delete a property from an object? Answer: Use the delete operator to remove a property. Example: delete person.occupation; console.log(person); Explanation: This removes the occupation property from the person object. Question: How do you check if an object contains a specific property? Answer: Use the in operator or hasOwnProperty method. Example: console.log('name' in person); // Output: true console.log(person.hasOwnProperty('age')); // Output: true Explanation: Both methods check for the existence of a property in an object. Learn more about JavaScript with Examples and Source Code Laurence Svekis Courses https://basescripts.com/ 4
  • 5. Question: How can you iterate over the properties of an object? Answer: Use a for...in loop to iterate over object properties. Example: for (let key in person) { console.log(key + ': ' + person[key]); } Explanation: The loop iterates over each enumerable property of the object. Question: How do you create a copy of an object? Answer: Use Object.assign or spread syntax {...} to create a shallow copy. Example with Object.assign: let personCopy = Object.assign({}, person); console.log(personCopy); Explanation: Object.assign copies properties from one or more source objects to a target object. Learn more about JavaScript with Examples and Source Code Laurence Svekis Courses https://basescripts.com/ 5
  • 6. Question: How do you merge two objects? Answer: Merge objects using Object.assign or spread syntax. Example with spread syntax: let additionalInfo = { gender: 'female', city: 'New York' }; let mergedPerson = {...person, ...additionalInfo}; console.log(mergedPerson); Explanation: Spread syntax is used to combine the properties of person and additionalInfo into mergedPerson. Question: How do you find the number of properties in an object? Answer: Use Object.keys() to get an array of properties and then find its length. Example: console.log(Object.keys(person).length); // Output: Number of properties Explanation: Object.keys() returns an array of a given object's property names. Learn more about JavaScript with Examples and Source Code Laurence Svekis Courses https://basescripts.com/ 6
  • 7. Question: How do you prevent modifications to an object? Answer: Use Object.freeze() to make an object immutable. Example: Object.freeze(person); person.age = 30; // This will not change the age property console.log(person); Explanation: After freezing, no new properties can be added, existing properties cannot be removed or changed. Learn more about JavaScript with Examples and Source Code Laurence Svekis Courses https://basescripts.com/ 7