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Modern Front-end Development for Rails

Building Mapped Types and Utility Types

Explore how to use TypeScript's mapped types and utility types to create flexible and reusable type definitions. Understand how these advanced features help simplify code when working with optional, readonly, or non-nullable properties, enabling better code validation and maintainability.

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In addition to limiting variables to a set of specific literal values and defining enums, TypeScript allows you to define types that are based on other types, kind of like super-powered generics. These are called mapped types. TypeScript also has a bunch of predefined mapped types that it calls utility types.

So, let’s say we have our existing type TicketData:

interface TicketData {
  id: number
  row: number
  number:
...