Switch Matcher

Simple and lightweight library for handling switch statements and Pattern Matching in JavaScript and TypeScript.

Installation

To install the package, you can use npm or your favorite package manager.

npm install switch-matcher

Features

• Simple: Uses a syntax similar to JavaScript switch statements and chainable methods.
• Lightweight: Has few dependencies and is very lightweight.
• Versatile: Can be used in any JavaScript or TypeScript project.

Usage

Switch-Matcher provides two main interfaces to work with: the Switcher and Matcher classes (the latter through the match function). Here comes a more detailed description of the interfaces.

Switcher

SMSwitcher is a class that facilitates the definition and evaluation of conditions in a structured manner. It allows creating a pipeline through multiple cases (case), a default handler (default), and an alternative handler (else). Additionally, it supports both synchronous and asynchronous evaluations.

First, import the SMSwitcher class.

import { SMSwitcher } from "switch-matcher";

Creating a switcher

const switcher = new SMSwitcher<string, string>();

Defining cases

switcher
  .case("value1", () => "Handled value1")
  .case("value2", "Handled value2")
  .case((value) => value.startsWith("test"), "Handled test values")
  .default(() => "Default handler")
  .elseValue("Else handler");

Evaluating a value

const result = switcher.syncEval("value1"); // Result: 'Handled value1'
const promiseResult = switcher.eval("unknown"); // Result: 'Else handler'

Matcher

SMMatcher is a class similar to SMSwitcher, but designed to evaluate a specific value against multiple conditions more straightforwardly. It offers a direct way to define cases (case), a default handler (default), and an alternative value (else). Unlike Switcher, Matcher evaluates the cases at the moment and does not support asynchronous evaluations.

First, import the match function.

import { match } from "switch-matcher";

Creating a matcher

const matcher = match<string, string>("value1");

Defining cases

matcher
  .case("value1", () => "Handled value1")
  .case("value2", "Handled value2")
  .case((value) => value.startsWith("test"), "Handled test values")
  .default(() => "Default handler")
  .else("Else handler");

Getting the resulting value

const result = matcher.value; // Result: 'Handled value1' or 'Else handler' if no matches

Contributions

If you want to contribute to the project, you can follow these steps:

1. Fork the project.
2. Create a new branch.
3. Make your changes.
4. Commit your changes.
5. Push your changes to your fork.
6. Open a pull request.

And that's it! You can easily contribute to the project and help improve it.

Future Features

Here we will list the features we plan to add to the library in the future.

Credits

This package was developed by LeoLizc. We thank the following people and projects for their contributions:

• leovergaramarq: Brief description of their contribution.

License

This package is under the MIT license. You can view the license file here.