JavaScript

TotT: 2014

JavaScript

"JavaScript is a prototype-based scripting language with dynamic typing and first-class functions."
- Wikipedia

Major Attributes

• C-derived syntax
• Runtime interpretation
• Dynamic typing
• First-class functions
• Prototypical inheritence
• Garbage collection
• Rich literal types

Use Cases

• Embedded scripting
• Frontend web development
• Backend web development

Example: Factorial

Example: Sine/Cosine

Example: Mammals

Example: Evens

Example: Timers

Example: Cycle

Gotchas

• Function scope
• Automatic semicolons
• No true methods
• No import statement
• No multiline strings
• Weird operators

NodeJS

• New, circa 2009
• Run JS server-side
• Uses Google V8 JS engine
• Small standard library
• Event loop, async I/O

Demo: Working with NodeJS

Demo: Working with NodeJS

Review

• Language Features
• Syntax
• Types
• Prototypes
• Function Closures, Callbacks, Parameters
• NodeJS
• Gotchas