Real Typeof

Retrieve the real type of a variable, a more accurate version of the typeof operator.

This module has been improved for performance and it is getting better overtime.

Installation

$ npm i @kdts/real-typeof

Usage

Require CommonJS (default)

const real_typeof = require("@kdts/real-typeof");

Import ES-Module (default)

import real_typeof from "@kdts/real-typeof";

Import ES-Module (named)

import { real_typeof } from "@kdts/real-typeof";

ℹ️ When using typescript make sure to set the compiler option moduleResolution to Node16 or NodeNext.

Use in Code (more examples below)

let type = real_typeof(some_varibale);

if (type == "date") {
    // ...
} else if (type == "array") {
    // ...
}

real_typeof("") === "string";
real_typeof() === "undefined";
real_typeof(42) === "number";
real_typeof({}) === "object";
real_typeof([]) === "array";
real_typeof(/\d/) === "regexp";
real_typeof(null) === "null";
real_typeof(new Date()) === "date";
real_typeof(new Set()) === "set";
real_typeof(new WeakSet()) === "weakset";
real_typeof(new WeakMap()) === "weakmap";
real_typeof(BigInt("9007199254740991")) === "number";
real_typeof(() => {}) === "function";
real_typeof(async () => {}) === "function";
real_typeof(function* () {}) === "function";

Pass in true as a second parameter to get even more accurate results

real_typeof(BigInt("9007199254740991"), true) === "bigint";
real_typeof(() => {}, true) === "function";
real_typeof(async () => {}, true) === "asyncfunction";
real_typeof(function* () {}, true) === "generatorfunction";
// ... everything else remains the same

Benchmark

It will take a while to finish but it generate outputs on progress. As any benchmark the results are never accurate and every iteration will return different results. But if you are curious then run:

npm run benchmark

License

See LICENSE.

Copyright

Copyright © 2022. Kossi D. T. Saka.