Essential TypeScript 5, Third Edition

13 Advanced generic types

This chapter covers

• Using the JavaScript collection types with generic type parameters
• Iterating over type-safe collections
• Creating collection keys with index types
• Transforming types with mappings
• Using the built-in type mappings
• Selecting generic types with conditional type expressions

In this chapter, I continue to describe the generic type features provided by TypeScript and focus on the advanced features. I explain how generic types can be used with collections and iterators, introduce the index types and type mapping features, and describe the most flexible of the generic type features: conditional types. Table 13.1 summarizes the chapter.

Table 13.1 Chapter summary

Problem	Solution	Listing