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Prateek Parekh

JavaScript is the most commonly used programming language and functions are one of the fundamental building blocks in JavaScript. The skills you learn in this course will help you learn other JavaScript frameworks such as React and Node.js.

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JavaScript is the most commonly used programming language and functions are one of the fundamental building blocks in JavaScript. The skills you learn in this course will help you learn other JavaScript frameworks such as React and Node.js.

Code is hard to maintain, especially when you keep adding new features to your project over several months and years. If you are not careful, you can end up with spaghetti code where several parts of the project are essentially doing the same task and any change in one feature can cause changes in several other parts of the code. In this course, JavaScript: Functions, you’ll learn the foundational knowledge to write modular code that not only prevents duplication, but also increases code readability and maintainability. First, you’ll explore what Functions are and how to write them. Next, you’ll discover the power of Arrow Functions in improving readability. Finally, you’ll gain the ability to use additional language features that come with JavaScript out-of-the-box to write applications with multiple functions interacting with each other. When you’re finished with this course, you’ll have the skills and knowledge of Functions needed to write modular, re-usable, and concise code in JavaScript.

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What's inside

Syllabus

Course Overview
Writing Modular Code with Functions
Improving Readability with Arrow Functions
Changing Function Context and Built-in Functions
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Constructing Rest Parameters and the Spread Operator

Good to know

Know what's good
, what to watch for
, and possible dealbreakers
Teaches about functions, which are building blocks of JavaScript and other frameworks
Suitable for beginners who want to write modular, reusable, and concise code in JavaScript
Concepts are supplemented with visual aids and hands-on exercises
Requires students to use their own computer with JavaScript development environment set up

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Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in JavaScript: Functions with these activities:
Review imperative programming concepts
Brush up on the core concepts of imperative programming to ensure a solid foundation for understanding functions in JavaScript.
Browse courses on Imperative Programming
Show steps
  • Revisit data types, variables, and operators
  • Review control flow statements (if-else, loops)
  • Practice writing simple functions in an imperative programming language
Explore the official JavaScript Functions documentation
Delve into the official JavaScript Functions documentation to gain a comprehensive understanding of their syntax, usage, and best practices.
Show steps
  • Navigate to the MDN Functions documentation
  • Read through the Function Definition and Arrow Function sections
  • Explore examples and code snippets to clarify concepts
  • Experiment with writing simple functions in your own code editor
Practice writing different types of functions
Reinforce your understanding of functions by practicing writing various function types, including arrow functions, named functions, and functions with default parameters.
Show steps
  • Create a file for function practice
  • Write a function to calculate the area of a triangle
  • Write an arrow function to convert a temperature from Fahrenheit to Celsius
  • Define a function with default parameters to greet a user
Four other activities
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Join a study group to discuss function concepts
Engage with peers to exchange knowledge, clarify doubts, and reinforce your understanding of functions through discussions and collaborative problem-solving.
Show steps
  • Find a study group or online forum focused on JavaScript functions
  • Actively participate in discussions, asking questions and sharing insights
  • Work together on practice problems and code challenges
Read 'JavaScript: The Good Parts' by Douglas Crockford
Delve into the nuances of JavaScript functions with Douglas Crockford's classic guide. His insights will provide a deeper understanding of best practices and common pitfalls.
Show steps
  • Read Chapter 6: 'Functions'
  • Review the sections on function scope, closures, and higher-order functions
  • Apply the concepts in your own code and discuss them with peers
  • Reflect on how Crockford's insights enhance your understanding of functions
Build a simple JavaScript calculator
Apply your knowledge of functions by creating a basic calculator that performs arithmetic operations. This project will help you grasp the practical application of functions.
Show steps
  • Plan the calculator's functionality
  • Define functions for each operation (addition, subtraction, multiplication, division)
  • Create a user interface to input numbers and select operations
  • Implement error handling for invalid input
  • Test and refine the calculator's functionality
Contribute to an open-source project that utilizes JavaScript functions
Immerse yourself in real-world function application by contributing to an open-source project. This hands-on experience will deepen your understanding and foster collaboration.
Show steps
  • Identify an open-source project on GitHub that uses JavaScript functions
  • Review the project's documentation and codebase
  • Identify an area where you can contribute a function or improve existing ones
  • Submit a pull request with your proposed changes
  • Collaborate with project maintainers to refine and merge your contribution

Career center

Learners who complete JavaScript: Functions will develop knowledge and skills that may be useful to these careers:
Web Developer
Web Developers create and maintain websites. Websites are essential for businesses of all sizes in today's global market. In this role, you will use JavaScript, alongside other programming languages, to write reusable, concise, modular code for websites. This course teaches the fundamentals of functions in JavaScript, which will help you succeed in this career. If you are seeking a career in web development, then you should consider taking this course to enhance your skills in JavaScript.
Software Engineer
Software Engineers apply engineering principles to the design, development, deployment, and maintenance of software systems. In this role, you will use many different programming languages to develop software for a wide range of industries. JavaScript is one of the most popular programming languages, so learning JavaScript functions is essential for your success as a Software Engineer. This course in particular will teach you how to write modular code in JavaScript, which is an important skill for any Software Engineer.
Front-End Developer
Front-End Developers focus on the user-facing side of a website or web application. While Back-End Developers focus on the server-side, Front-End Developers implement features for application interfaces, such as features for the display of text, images, videos, and interactive elements. This course on JavaScript will help you succeed as a Front-End Developer, since it will teach you how to write modular, reusable code. This will help you organize your code and create maintainable, scalable web applications.
JavaScript Developer
JavaScript Developers have a deep understanding of the JavaScript language and can use it to create a variety of applications, including web applications, mobile applications, and desktop applications. This course teaches the fundamentals of JavaScript functions, which are essential for any JavaScript Developer. Taking this course will help you understand how to write more concise, reusable code, which will help you succeed as a JavaScript Developer.
Full-Stack Developer
Full-Stack Developers design, develop, deploy, and maintain both the front-end and the back-end of applications. These professionals have a strong understanding of both front-end and back-end technologies. JavaScript is a popular programming language for both the front-end and back-end, so it is essential for Full-Stack Developers to have a strong understanding of JavaScript functions. This course on JavaScript functions will help you to build a strong foundation in writing maintainable, reusable JavaScript code.
Back-End Developer
Back-End Developers focus on the server-side of a website or web application. While Front-End Developers focus on the user-facing side, Back-End Developers implement server-side functionality, such as database management and server-side programming. This course on JavaScript functions will help you if you wish to become a Back-End Developer, since you will learn how to write modular, well-organized JavaScript code. This will help you create maintainable, scalable applications.
Mobile Developer
Mobile Developers create applications for mobile devices. These professionals must have a strong understanding of the different mobile platforms and the different programming languages used to develop for them. JavaScript is one of the most popular programming languages for mobile development, and this course will help you to learn the fundamentals of JavaScript functions. If you want to become a Mobile Developer, you should consider taking this course to strengthen your JavaScript skills.
Game Developer
Game Developers design, develop, and test video games. These professionals must have a strong understanding of game design principles and programming languages. JavaScript is one of the most popular programming languages for game development, and this course will help you to learn the fundamentals of JavaScript functions. If you want to become a Game Developer, you should consider taking this course to improve your JavaScript skills.
Data Scientist
Data Scientists use data to solve business problems. These professionals must have a strong understanding of data analysis techniques and programming languages. JavaScript is one of the most popular programming languages for data science, and this course will help you to learn the fundamentals of JavaScript functions. If you want to become a Data Scientist, you should consider taking this course to enhance your JavaScript skills.
UX Designer
UX Designers focus on the user experience of a website or web application. These professionals must have a strong understanding of user experience principles and programming languages. JavaScript is one of the most popular programming languages for UX design, and this course will help you to learn the fundamentals of JavaScript functions. If you want to become a UX Designer, you should consider taking this course to strengthen your JavaScript skills.
Product Manager
Product Managers plan, develop, and launch products. These professionals must have a strong understanding of product development principles and programming languages. JavaScript is one of the most popular programming languages for product management, and this course will help you to learn the fundamentals of JavaScript functions. If you want to become a Product Manager, you should consider taking this course to improve your JavaScript skills.
Project Manager
Project Managers plan, execute, and close projects. These professionals must have a strong understanding of project management principles and programming languages. JavaScript is one of the most popular programming languages for project management, and this course will help you to learn the fundamentals of JavaScript functions. If you want to become a Project Manager, you should consider taking this course to enhance your JavaScript skills.
Business Analyst
Business Analysts help businesses to improve their processes and systems. These professionals must have a strong understanding of business analysis techniques and programming languages. JavaScript is one of the most popular programming languages for business analysis, and this course will help you to learn the fundamentals of JavaScript functions. If you want to become a Business Analyst, you should consider taking this course to strengthen your JavaScript skills.
Technical Writer
Technical Writers create user manuals, white papers, and other documentation. These professionals must have a strong understanding of technical writing principles and programming languages. JavaScript is one of the most popular programming languages for technical writing, and this course will help you to learn the fundamentals of JavaScript functions. If you want to become a Technical Writer, you should consider taking this course to improve your JavaScript skills.
Quality Assurance Analyst
Quality Assurance Analysts test software to ensure that it meets quality standards. These professionals must have a strong understanding of quality assurance principles and programming languages. JavaScript is one of the most popular programming languages for quality assurance, and this course will help you to learn the fundamentals of JavaScript functions. If you want to become a Quality Assurance Analyst, you should consider taking this course to enhance your JavaScript skills.

Reading list

We've selected eight books that we think will supplement your learning. Use these to develop background knowledge, enrich your coursework, and gain a deeper understanding of the topics covered in JavaScript: Functions.
Provides a comprehensive introduction to JavaScript, covering the basics of the language as well as advanced topics such as functions, objects, and closures. It is written in a clear and concise style, and it includes numerous examples and exercises to help you learn the material. This book great resource for anyone who wants to learn more about JavaScript.
Comprehensive reference guide to JavaScript. It covers all aspects of the language, from the basics to the most advanced features. This book great resource for anyone who wants to learn more about JavaScript or for anyone who needs a reference guide.
Comprehensive guide to JavaScript. It covers all aspects of the language, from the basics to the most advanced features. This book great resource for anyone who wants to learn more about JavaScript or for anyone who needs a reference guide.
Classic guide to writing good JavaScript code. It covers the essential parts of the language, and it provides clear and concise advice on how to avoid common pitfalls. This book must-read for any JavaScript developer.
Classic guide to writing good JavaScript code. It covers the essential parts of the language, and it provides clear and concise advice on how to avoid common pitfalls. This book must-read for any JavaScript developer.
Comprehensive reference guide to JavaScript. It covers all aspects of the language, from the basics to the most advanced features. This book great resource for anyone who wants to learn more about JavaScript or for anyone who needs a reference guide.
Practical guide to using JavaScript for web development. It covers all aspects of the language, from the basics to the most advanced features. This book great resource for anyone who wants to learn more about JavaScript or for anyone who wants to use JavaScript for web development.
Fun and engaging introduction to JavaScript. It uses a visual approach to teaching, and it includes numerous examples and exercises to help you learn the material. This book great choice for anyone who wants to learn JavaScript in a fun and easy way.

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