get-internal-type

Determine the JavaScript [[Class]] of an object, where:

Object Value	[[Class]]	Version
undefined	undefined	1.0.0
null	null	1.0.0
false	boolean	1.0.0
Symbol("123")	symbol	1.0.0
123	number	1.0.0
BigInt(9007199254740991)	bigint	1.0.0
"hello"	string	1.0.0
/s+/gi	regexp	1.0.0
new Date()	date	1.0.0
new Error("A mistake")	error	1.0.0
{}	object	1.0.0
new (class SomeCustomClass {})	object	1.0.0
() => {}	function	1.0.0
function(){}	function	1.0.0
class Simple {}	function	1.0.0
[1,2,3]	array	1.0.0
new Set()	set	1.2.0
new WeakSet()	set	1.3.1
new Map()	map	1.2.0
new WeakMap()	map	1.3.1
new Int8Array(8)	typedarray	1.3.0
new Uint8Array()	typedarray	1.3.0
new Uint8ClampedArray()	typedarray	1.3.0
new Int16Array()	typedarray	1.3.0
new Uint16Array()	typedarray	1.3.0
new Int32Array()	typedarray	1.3.0
new Uint32Array()	typedarray	1.3.0
new Float32Array()	typedarray	1.3.0
new Float64Array()	typedarray	1.3.0
new BigInt64Array()	typedarray	1.3.0
new BigUint64Array()	typedarray	1.3.0
Promise.resolve('any')	promise	1.4.0
function* () {}	generatorfunction	1.4.1
(function* () {})()	generator	1.4.1
new ArrayBuffer(8)	arraybuffer	1.5.0
new DataView(buffer)	dataview	1.5.0

Install

npm install @lopatnov/get-internal-type

Browser

<script src="//lopatnov.github.io/get-internal-type/dist/polyfills/array.forEach.min.js"></script>
<script src="//lopatnov.github.io/get-internal-type/dist/get-internal-type.min.js"></script>

Browser support: Cross-browser

Import package to the project

TypeScript

import getInternalType from 'get-internal-type';

JavaScript

var getInternalType = require("get-internal-type");

Gets object type

getInternalType(obj: any) => string

console.log(getInternalType(undefined)) // expected "undefined"
console.log(getInternalType(null)) // expected "null"
console.log(getInternalType(false)) // expected "boolean"
console.log(getInternalType(Symbol("123"))) // expected "symbol"
console.log(getInternalType(123)) // expected "number"
console.log(getInternalType(BigInt(9007199254740991))) // expected "bigint"
console.log(getInternalType("hello")) // expected "string"
console.log(getInternalType(/s+/gi)) // expected "regexp"
console.log(getInternalType(new Date())) // expected "date"
console.log(getInternalType(new Error("A mistake"))) // expected "error"
console.log(getInternalType({})) // expected "object"
console.log(getInternalType(new (class SomeCustomClass {}))) // expected "object"
console.log(getInternalType(() => {})) // expected "function"
console.log(getInternalType(function(){})) // expected "function"
console.log(getInternalType(class Simple {})) // expected "function"
console.log(getInternalType([1,2,3])) // expected "array"

console.log(getInternalType(new Set())) // expected "set"
console.log(getInternalType(new WeakSet())) // expected "set"
console.log(getInternalType(new Map())) // expected "map"
console.log(getInternalType(new WeakMap())) // expected "map"

console.log(getInternalType(new Int8Array(8))) // expected "typedarray"
console.log(getInternalType(new Uint8Array())) // expected "typedarray"
console.log(getInternalType(new Uint8ClampedArray())) // expected "typedarray"
console.log(getInternalType(new Int16Array())) // expected "typedarray"
console.log(getInternalType(new Uint16Array())) // expected "typedarray"
console.log(getInternalType(new Int32Array())) // expected "typedarray"
console.log(getInternalType(new Uint32Array())) // expected "typedarray"
console.log(getInternalType(new Float32Array())) // expected "typedarray"
console.log(getInternalType(new Float64Array())) // expected "typedarray"
console.log(getInternalType(new BigInt64Array())) // expected "typedarray"
console.log(getInternalType(new BigUint64Array())) // expected "typedarray"

console.log(getInternalType(Promise.resolve('any'))) // expected "promise"
console.log(getInternalType(function* () {})) // expected "generatorfunction" (ES6)
console.log(getInternalType((function* () {})())) // expected "generator"

console.log(getInternalType(new ArrayBuffer(16))) // expected "arraybuffer"
console.log(getInternalType(new DataView(new ArrayBuffer(16)))) // expected "dataview"

Demo

See, how it's working: https://runkit.com/lopatnov/get-internal-type-demo

Test it with a runkit: https://npm.runkit.com/%40lopatnov%2Fget-internal-type

Rights and Agreements

License Apache-2.0