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JavaScript Level 3 Course: Master Asynchronous Processing, APIs, UI, and Class Design

Starting on May 12, 2026, C&R Corporation will host a free online seminar series titled 'JavaScript Level 3: Practical Edition'. This four-part course is tailored for web designers, coders, markup engineers, and web directors wishing to refine their JavaScript skills significantly. The series' focus is on key practical aspects of JavaScript, including asynchronous processing, API integration, user interface enhancements, and class design—all essential in today’s web development landscape.

JavaScript has become a cornerstone of web development, enabling complex interactions and improving user experience beyond the capabilities of HTML and CSS. As applications increasingly require seamless operations without page reloading, the power of JavaScript becomes indispensable. This course aims to elevate participants' practical skills in using JavaScript effectively.

Course Overview

Course Structure:

• - Session 1: May 12, 2026, 19:00–21:00

- Explore asynchronous operations using Promise and Fetch API to manage server interactions. Understand how to handle errors and check the responses using DevTools.

• - Session 2: May 19, 2026, 19:00–21:00

- Dive into async/await syntax for cleaner asynchronous code. Explore error handling with try/catch mechanisms and learn effective data manipulation.

• - Session 3: May 26, 2026, 19:00–21:00

- Enhance UI element responsiveness through libraries and animations. Delve into npm for managing JavaScript packages effectively.

• - Session 4: June 2, 2026, 19:00–21:00

- Learn about object-oriented programming concepts by creating classes, understanding constructors, and managing inheritance effectively.

Instructor Profile: Kazuma Sekiguchi, CTO of Comsent, will lead the sessions, sharing his extensive expertise in web design and program development. His holistic understanding of both the technical and aesthetic aspects of web development positions him to teach participants effectively.

Who Should Attend?

This course is perfect for those who:

• - Are familiar with HTML and CSS basics.
• - Have a foundational knowledge of JavaScript.
• - Wish to work with APIs and asynchronous processes.
• - Want to enhance their UI skills and gain familiarity with libraries and npm.
• - Aim to grasp class-based design and improve their coding organization.

Course Registration Details:

• - Each session has a 60-participant capacity.
• - A stable internet connection, along with recent versions of Visual Studio Code and Google Chrome, is required.
• - Participants will be provided with examples and code programs for review, but note that there will be no session archives available.

For interested participants, registration is available here! The registration deadline is 21:00 on May 12, 2026.

About C&R Corporation

Founded in 1990, C&R acts as a pioneer in the field of creator agencies, offering extensive services that include career consulting, seminars, and skill enhancement opportunities for creators across various disciplines. Their longstanding mission is to enhance professional lifetime value and support creators in realizing their fullest potential.

For more information on future events and a full range of IT and programming seminars, please visit Creative Village or subscribe to their newsletter.