js-subtype

js-subtype is a lightweight library that allows you to determine JavaScript subtypes, making it easy to identify the exact type of an object (like Array, Date, etc.).

Features

• Supports multiple subtypes (Array, Date, Map, RegExp, etc.).
• Lightweight and easy to use.
• Zero dependencies.
• Works in both Node.js and modern browsers.

Installation

Install using npm:

npm install js-subtype

Or with yarn:

yarn add js-subtype

Usage

Here’s a quick example of how to use js-subtype:

const { getType } = require("js-subtype");

console.log(getType([1, 2, 3])); // Output: "Array"
console.log(getType(new Date())); // Output: "Date"
console.log(getType(/regex/)); // Output: "RegExp"

API

getType(value)

Returns a string representing the subtype of the given value.

• Parameters:
  • value: Any JavaScript value.
• Returns: The string subtype (Array, Date, Map, etc.).

Use Cases

Advanced Type Validation

Use js-subtype to validate inputs or types precisely in your applications:

function validateInput(input) {
  if (getType(input) !== "Array") {
    throw new Error("Input must be an array.");
  }
  // Additional logic...
}

Identifying Native JavaScript Objects

Determine the exact native type of an object, such as Map or Set:

console.log(getType(new Map())); // Output: "Map"
console.log(getType(new Set())); // Output: "Set"

License

This project is licensed under the MIT License.