What is TypeScript?

• TypeScript as a superset of JavaScript.

Advantages of using TypeScript

• Type Safety
• Maintainability
• Early Error Detection

Outline

TypeScript Types and Annotations

• Explaining primitive types: number, string, boolean.
• Using type annotations to specify variable types.
• Demonstrate type inference.

Alias Types and Union Types

• Introduction to type aliases for custom type names.
• Explaining union/intersection types for variables that can hold different types.

Functions in TypeScript

• Ways to define function
  • Function Declaration
  • Function Expression
  • Arrow Function Expression
  • Arrow Function Expression (Shorter Syntax for Single Expression)
  • Method within an Object Literal
• Writing functions with explicit parameter types and return types.
• Optional and default parameters.
• Rest parameters and spread syntax.
• Async function

Example

• Calculator function
• Write test helper