matchbook is a lightweight & easy to use pattern matching library, for TypeScript and JavaScript.

If you want to know more about matchbook, check out the docs!

Programming language: TypeScript
License: MIT License

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๐Ÿ”ฅ matchbook

pattern matching in typescript & javascript made easy

matchbook is a lightweight & easy to use pattern matching library, for TypeScript and JavaScript.

If you want to know more about matchbook, check out the docs or read on!

If you want to start using matchbook, install it like any other npm package:

npm i @matchbook/ts

[it's as easy as a-b-c 1-2-3](assets/readme-samples/static/abc_123.snippet.png)


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table of contents

what matchbook does for you

(list is in no particular order)

  • expressive - pattern matching helps you write less code that's more expressive than if/else trees
  • simple - API is just 5 functions, 1 error class, and some stylistic aliases for the core functions
  • powerful - type inference backed by Typescript
  • well documented - check out the docs here!
  • low cost - no runtime dependencies, & small package size
  • reliable - 100% unit test coverage, with all pushes verified via Travis CI

what you can do for matchbook

use it!

The project is very minimal, with the intent of starting with a very simple & focused API that grows with its needs.

ask questions!

If you have any questions, any feedback, or just want to shoot the shirt, open an issue of type question, and we'll do our best to answer quickly!

pattern matching explained

Pattern matching is a modern language feature that is similar to a switch / case statement.

With pattern matching, you can switch on the type of the incoming value, meaning you can reduce a lot of extra-verbose if-else branches just by replacing them with pattern matching statements.

You might consider using pattern matching if you find you're switching on types or states frequently, and want to handle the different cases in a concise and expressive way.

This project takes heavy inspiration from Rust's pattern matching idiom.

matchbook at a glance

want to know more? read the docs! [matchbook at a glance](assets/readme-samples/static/10-000-feet.snippet.png)

matchbook at a slightly longer glance

want to know more? read the docs!

switching on part of an object

[enum example](assets/readme-samples/static/structure.snippet.png)

switching on an enum

[enum example](assets/readme-samples/static/enum.snippet.png)

acting on the type of an Event

Type guards [enum example](assets/readme-samples/static/type_guard.snippet.png)

matching if a value is an instanceof a constructor

[enum example](assets/readme-samples/static/ctor.snippet.png)

*Note that all licence references and agreements mentioned in the ๐Ÿ”ฅ matchbook README section above are relevant to that project's source code only.