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Generics

Multiple Type Parameters

Master defining multiple generic parameters (<T, U, K, V>), tuple mapping, key-value dictionaries, and multi-generic function design in TypeScript.

Last Updated: July 29, 2026 • 10 min read

Functions, interfaces, and classes can declare multiple generic type parameters separated by commas (e.g., , , ).

1. Naming Conventions for Multiple Generics

  • T, U, V: General generic types (Type 1, Type 2, Type 3)
  • K, V: Key and Value types (Dictionaries, Maps)
  • P: Property type
  • E: Element type (Collections, Arrays)
  • Descriptive names (Input, Output, Req, Res): Recommended for complex domain types

    • 2. Generic Key-Value Patterns ()

    3. Function Transformation Pipeline ()

    4. Interactive Code Playground

    Test multiple generic parameters below:

    5. Summary Table

    Multiple Generic PatternExample Syntax
    Pairing / Tuples(a: T, b: U): [T, U]
    Map / Dictionary
    | Transformer / Mapper | (val: Input): Output |