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JavaScript as Development Platform
The document provides an in-depth overview of JavaScript, detailing its history, design principles, and runtime environments, highlighting its evolution from a lightweight scripting language to a major programming language. It covers key concepts such as global vs. local scope, the significance of strict mode, and various best practices for using JavaScript effectively in web development. The document also includes discussions about JavaScript's strengths and weaknesses, its type system, and common pitfalls encountered during programming.
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JavaScript as Development Platform
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- 2. CONVENTIONS SOURCE CODE BAD PRACTICE LEGACY CODE var global = 10; function factorial(x) { if (x <= 1) { function foo() { return 1; global++; } } return x * arguments.callee(x - 1); } GOOD PRACTICE (function () { var local = 10; CODE SNIPPET function foo() { function foo() { local++; console.log(‘foo’); } } })();
- 3. WHAT IS javascript The world`s most misunderstood programming language
- 4. SOURCES OF CONFUSION JAVA PREFIX Completely independent from Java Has syntax similarities
- 5. SOURCES OF CONFUSION SCRIPT POSTFIX Doesn’t mean that JS isn`t real programming language Full-fledged Object Oriented language
- 6. SOURCES OF CONFUSION WEAK LEARNING SOURCES Standard has complicated structure makes it hard to read and understand Almost all books are universally bad Internet full of bad advices and practices
- 7. LEARNING SOURCES BOOKS Javascript: the definitive guide Javascript: the GOOD parts
- 8. WHAT IS Javascript A scripting language designed as lightweight alternative to Java for Web
- 9. history 1992 James Gosling at Sun Microsystems has been working on superior language to C++ called Oak
- 10. history 1992 Microsoft released Windows 3.1 and preview of Microsoft Windows NT for developers