Yalco's TypeScript (English ver.)

Type System and Basic Types

• Introduction to TypeScript and setup

• Basic types: string , number , boolean

• null vs undefined / void / never

• Literal types

Arrays and Tuples

• Array types and multidimensional arrays

• Readonly arrays ( ReadonlyArray )

• Tuples: arrays with fixed types and order

Enums

• Numeric / string / heterogeneous enums

• const enum and optimization

Functions

• Declarations / expressions / arrow functions

• Optional parameters/default values/rest parameters

• Function type definitions and callback structure

Interfaces

• Defining object types

• Optional & readonly プロパティ

• Defining functions and methods

• Interface inheritance / multiple inheritance / nesting

• Interface merging

• Applying implements to classes

Classes and Object-Oriented Programming

• Class declarations/constructors/access modifiers

• Inheritance, overriding, super keyword

• Polymorphism

• Abstract classes ( abstract )

Advanced Types

• Intersection types / Union types

• Type guards: typeof / in / instanceof / custom guards

• Mapped types / Template literal types

• Combining optional & readonly プロパティ

• keyof / infer /Conditional types

Generics

• Generic functions and type inference

• Generic arrays/tuples/interfaces/type aliases

• Constraints with extends

• Using keyof and conditional types

• Practical examples: return types, etc.

Built-in Generics and Utility Types

• Array , ReadonlyArray , Map , Set , WeakMap , WeakSet

• Promise and asynchronous types

• Utility types like Partial , Required , Readonly , and more

モジュールシステムと構成

• Namespaces and nested structures

• Modularization: import / export syntax

• tsconfig settings: baseUrl , paths , strict options

• JSON import、 esModuleInterop 、etc。

Declaration Files

• Creating and using .d.ts files

• Using @types packages