Motivations 
- Web documents (oac client-side web programs) are fetched from a web server system, and they are displayed on web browers.
- Web documents (oac client-side web programs) are texts, not compiled machine code. Why?
- Web documents (oac client-side web programs) need programming logic to respond to events to support user interactions.
- JavaScript is a programming language to support the above programming logic. There is only one at the client-side, but there are multiple programming languages at the server-side.
- A web document (orc web app) consitst of HTML5, CSS3, and JavaScript. Is JavaScript code compiled or text?
- Example of drop-down menu and modal windows - Do you think you can write the code only with HTML5 and CSS3?
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How to learn?
Learn by examples - Because you learned a programming language, you know basic programming syntaxes and have problem solving skill. You don't have to learn JavaSript from the scratch.
Comparison between JavaScript and Java - They are different programming languages.
JavaScript Java Multiple files? Generally, no Yes Compilation required? No (Code will be interpreted.) Yes Scripting language? Yes No Platform Web browsers JVM/OS Programming style? Sequential Object-oriented Event-driven programming? Yes Possible Use of objects? Yes, but no class Yes Modula programming? Functions; objects and methods Classes; objects and methods Difficult to use? No ? Objectives? Access to HTML elements General apps
Learning outcomes