Use Codington in class

Goal: Set up a strong baseline for core types and function typing

• Primitives

  25 minEasy
• Functions Basics

  30 minEasy

Wrap-up: Use the final 15 minutes to review explicit vs inferred types and common parameter mistakes.

Goal: Move from basic syntax to object and collection modeling

• Object Types Basics

  30 minEasy
• Arrays

  25 minEasy
• Type Aliases

  20 minEasy

Homework: Assign one extra category drill and ask students to explain their type choices in comments.

Goal: Model real data and avoid runtime bugs

• Union & Litteral Types

  30 minEasy
• Interfaces

  30 minEasy

Discussion prompt: When to use `type` vs `interface`.

Goal: Handle uncertainty safely in TypeScript

• null & undefined

  25 minIntermediate
• Type Guards & Narrowing

  35 minIntermediate

Practice prompt: Ask students to rewrite one weakly-typed helper into a proper narrowing flow.

Goal: Use assertions carefully and prefer safer alternatives

• Type Assertions

  25 minIntermediate
• any (vs unknown)

  30 minIntermediate

Key takeaway: Why `unknown` is safer than `any`.

Goal: Build reusable, type-safe abstractions with type parameters

• Generics Fundamentals

  40 minIntermediate

Checkpoint: Have students explain where inference is enough versus where explicit type parameters help.

Goal: Understand how TypeScript models complex APIs

• Functions: Call Signatures & Overloads

  35 minAdvanced
• Object Types (Deep Dive)

  30 minAdvanced

Review: API design patterns and overload tradeoffs (15 min).

Goal: Compose type-safe helpers from existing values and shapes

• Creating Types from Types (Utility Patterns)

  35 minAdvanced
• keyof, typeof & Indexed Access

  35 minAdvanced

Wrap-up: Show how TypeScript inference flows across function parameters, return types, and object access patterns.