TypeScript Concepts: A Complete Reference

When a topic is stated as requirement, familiarity with the concepts listed below is required.

Arrays

JavaScript arrays, their methods, and techniques for manipulation

Functions

JavaScript functions, including parameters, return types, and signatures

Objects

JavaScript objects, property access, and manipulation

Generics

Type parameters that allow components to work with multiple data types

| Unions

Types allowing a value to be one of multiple specified types (e.g., `string | number`)

Intersections

Types combining multiple types into one (e.g., `{ name: string } & { age: number }`)

Mapped Types

Types that create new variations by transforming the properties of existing ones

Utility Types

Built-in helpers like Partial, Required, and Pick for common type transformations

Recursive Types

Types that reference themselves to model nested or self-similar structures

Type Guards

Runtime checks that narrow a variable’s type within conditional logic

? Conditional Types

Types that choose between outcomes based on a compile-time condition