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???? 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


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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 currently in beta, meaning the functionality & API are complete & fully covered by tests, but the library hasn't been battle-tested and may need some final tweaks before v1.0.0.

watch it!

Watch the project for releases to be notified of cool new features, and the v1.0.0 release!

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

matchbook at a slightly longer glance

want to know more? read the docs!

switching on part of an object

enum example

switching on an enum

enum example

acting on the type of an Event

enum example

matching if a value is an instanceof a constructor

enum example

Current Tags

  • 1.0.0-beta.3                                ...           latest (2 months ago)

12 Versions

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