TypeScript - TypeScript Features

JavaScript Characteristics

Good

• Prototypical Inheritance instead of Classes
• Not type-less but dynamically typed
• Just In Time compiled
• Variables can hold any object
• Implicit type coercion (string to int, etc)

Bad

• Difficult to ensure proper tests
• Enterprise scale apps can have thousands of lines of code
• Not everyone uses === for type comparisons

TypeScript Characteristics

TypeScript is Javascript. It is a superset of Javascript.

http://www.typescriptlang.org

Features

• Supports standard javascript
• Provides standard Typing (object types)
• Has built in Type definitions of Javascript
• Encapsulation through classes and Modules (also known as Naming Containers, Namespaces)
• Constructors, properties, functions, etc.
• Supports Interfaces (contract to objects)
• Supports ‘lambdas’
• Good IDE support
• Follows ES6+ Syntax as much as possible