@varunsridharan/js-is

JS IS

ES6 JavaScript Type Check Library.

⚙️Installation

The preferred way to install this extension is through NPM.

$ npm install @varunsridharan/js-is --save-dev

🚀 Usage

import { isUndefined } from "@varunsridharan/js-is"
var var1 = 'your-value';

if( isUndefined(var1) ){
    alert('Var1 is defined')
}

if( isUndefined(var2) ){
    alert('Var1 is defined')
} else {
    alert('Var2 is NOT defined')
}

🏗 Functions

isNull

import { isNull } from "@varunsridharan/js-is"

isNull( null ); // true

isNull( 42 ); // false

isObject

import { isObject } from "@varunsridharan/js-is"

isObject( { foo: 'bar' } ); // true

isObject( null ); // false

isObject( 'foo' ); // false

isArguments

import { isArguments } from "@varunsridharan/js-is"

var getArguments = function() {
	return arguments;
};

isArguments( getArguments() ); // true

isArguments( { foo: 'bar' } ); // false

isArray

import { isArray } from "@varunsridharan/js-is"

isArray( ['foo', 'bar', 'baz'] ); // true

isArray( {foo: 'bar'} ); // false

isBoolean

import { isBoolean } from "@varunsridharan/js-is"

isBoolean( true ); // true

isBoolean( false ); // true

isBoolean( 'value' ); // false

isTrue

import { isTrue } from "@varunsridharan/js-is"

isTrue( true ); // true

isTrue( false ); // false

isFalse

import { isFalse } from "@varunsridharan/js-is"

isFalse( false ); // true

isFalse( true ); // false

isDate

import { isDate } from "@varunsridharan/js-is"

isDate( new Date() ); // true

isDate( '20/09/2020' ); // false

isError

import { isError } from "@varunsridharan/js-is"

isError( new Error() ); // true

isError( 'unknown error' ); // false

isFunction

import { isFunction } from "@varunsridharan/js-is"

const tolowercase = ( string ) => String.toLowerCase.call( string );

function myfunction() {
	return 'Nothing';
}

isFunction( toString ); // true

isFunction( tolowercase ); // true

isFunction( myfunction ); // true

isFunction( { foo: bar } ); // false

isNan

import { isNan } from "@varunsridharan/js-is"

isNan( NaN ); // true

isNan( 1 ); // false

isNan( '1' ); // false

isNull

import { isNan } from "@varunsridharan/js-is"

isNull( null ); // true

isNull( 1 ); // false

isNull( '1' ); // false

isNumber

import { isNumber } from "@varunsridharan/js-is"

isNumber( 42 ); // true

isNumber( '42' ); // false

isNumber( NaN ); // false

isNumeric

import { isNumeric } from "@varunsridharan/js-is"

isNumeric( 42 ); // true

isNumeric( '42' ); // true

isNumeric( NaN ); // false

isString

import { isNumeric } from "@varunsridharan/js-is"

isNumeric( '42' ); // true

isNumeric( 'your-string' ); // true

isNumeric( 42 ); // false

isNumeric( NaN ); // false

isUndefined

import { isUndefined } from "@varunsridharan/js-is"

const var2 = 'somevalue';

isUndefined( var1 ); // true

isUndefined( var2 ); // false

isUndefined( 'your-string' ); // false

isPlainObject

import { isPlainObject } from "@varunsridharan/js-is"

isPlainObject( {} ); // true

isUndefined( var2 ); // false

isUndefined( 'your-string' ); // false

isWindow

import { isWindow } from "@varunsridharan/js-is"

isWindow( window ); // true

isWindow( document ); // false

isElement

import { isDocument } from "@varunsridharan/js-is"

isDocument( yourelem ); // true

isDocument( 'window' ); // false

isDocument

import { isDocument } from "@varunsridharan/js-is"

isDocument( document ); // true

isDocument( window ); // false

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📝 Changelog

All notable changes to this project will be documented in this file.

The format is based on Keep a Changelog, and this project adheres to Semantic Versioning.

Checkout CHANGELOG.md

🤝 Contributing

If you would like to help, please take a look at the list of issues.

💰 Sponsor

I fell in love with open-source in 2013 and there has been no looking back since! You can read more about me here. If you, or your company, use any of my projects or like what I’m doing, kindly consider backing me. I'm in this for the long run.

• ☕ How about we get to know each other over coffee? Buy me a cup for just $9.99
• ☕️☕️ How about buying me just 2 cups of coffee each month? You can do that for as little as $9.99
• 🔰 We love bettering open-source projects. Support 1-hour of open-source maintenance for $24.99 one-time?
• 🚀 Love open-source tools? Me too! How about supporting one hour of open-source development for just $49.99 one-time ?

📜 License & Conduct

• General Public License v3.0 license © Varun Sridharan
• Code of Conduct

📣 Feedback

• ⭐ This repository if this project helped you! 😉
• Create An 🔧 Issue if you need help / found a bug

Connect & Say 👋

• Follow me on 👨‍💻 Github and stay updated on free and open-source software
• Follow me on 🐦 Twitter to get updates on my latest open source projects
• Message me on 📠 Telegram
• Follow my pet on Instagram for some dog-tastic updates!

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Built With ♥ By Varun Sridharan 🇮🇳

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