Runescan NPM | npm.io

✦ Introduction

The Runescan library aims to simplify conditional logic, allowing developers to avoid excessive if-else structures and make the code more readable and expressive.

✦ Documentation

The documentation is available in various versions and languages. Choose the version and language that suits you best:

Versão 1.0
- Documentation in English
- Documentation in Portuguese

✦ Installation

Installing the library is straightforward.

npm i runescan

Or use yarn if you prefer.

yarn add runescan

✦ Main Methods

Let's talk a bit about the main methods and what each one does.

match():

Method used to initialize a structure to perform checks on a value. It expects a value that can be of type string, number, bool.

  // importing the library
  import {match} from "runescan";

  // using the match method
  match(value)

with():

The with() method is used to perform checks and execute actions based on the received value. It expects two arguments:

expected:

The value with which you want to compare the initial value provided to the match() method. It can be a string, number, boolean, etc...

callback:

A function to be executed if there is a match between the initial value and the expected value. This function can contain the desired logic to handle the match.

outherWise():

The outherWise method, as the name suggests, is a outherWise method that will be executed if there is no match. It expects only one argument.

callback:

A function to be executed if there is no match between the initial value and the expected values

✦ Example of Use

Problem: Role-Based User Authentication

Introduction:

Imagine a complex user authentication system, where different users have access to specific resources based on their roles. For example, a user can be an administrator, a moderator, or a standard user, each with different permissions.

Solution using Runescan:

import { match } from "runescan";

// Example user and their role
const user = {  
   name: "John",  
   role: "admin", // Can be "admin", "moderator", or "user"
};

// Using Runescan to simplify conditional logic

const accessLevel = match(user.role)
.with("admin", () => "Full access granted")  
.with("moderator", () => "Moderate access granted")  
.with("user", () => "Limited access granted")  
.outherWise(() => "User role not recognized");

// Result
console.log(accessLevel);