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TypeScript Academy · Lesson

Conditional Types

Explore how conditional types allow you to create types that dynamically adjust based on conditions, enabling flexible and reusable type definitions.

1

Introduction to Conditional Types

Conditional types in TypeScript allow you to create types that adapt dynamically based on a condition, making your code more flexible and reusable.

They use a syntax similar to JavaScript's conditional (ternary) operator.

Conditional Types — illustration 1

2

What Are Conditional Types?

Conditional types allow you to define a type that depends on another type. The basic syntax is:

T extends U ? X : Y

This means: If T extends U, the type is X, otherwise it is Y.

All lessons in this course

  1. Advanced Type Narrowing
  2. Advanced Class Features
  3. Conditional Types
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