typeiss.js

It can check all data types.

Value	typeiss.js
Undeclared variables	Undefined
undefined	Undefined
Boolean	Boolean
Number	Number
String	String
Function	Function
Array	Array
Object	Object
Date	Date
RegExp	RegExp
Set	Set
Map	Map

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Installation

npm install typeiss

Usage

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In ES6:

import { typeiss } from 'typeiss'

In Node.js:

const a = require('typeiss')

In a browser:

<script src="typeis.js"></script>

Examples

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// return variable type
typeiss(undefined) //return Undefined
typeiss(true)     //return Boolean
typeiss('string') //return String
···

// return the variable type is or not in an array
typeiss(undefined, ['Undefined'])   //return true
typeiss(true, ['Boolean','Array'])  //return true
typeiss(true, ['Array'])            //return false
typeiss('string', ['String','Boolean','Array'])  //return true
typeiss('string', ['Boolean','Array'])           //return false