https://github.com/varunsridharan/js-is
ES6 JavaScript Type Check Library
https://github.com/varunsridharan/js-is
es6 es6-javascript isjs javascript javascript-checkers javascript-ischeck javascript-istype javascript-library javascript-type javascript-typecheck js-istype js-lib js-library js-type jsis typecheck typechecker
Last synced: 11 months ago
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ES6 JavaScript Type Check Library
- Host: GitHub
- URL: https://github.com/varunsridharan/js-is
- Owner: varunsridharan
- Created: 2020-09-30T04:32:49.000Z (over 5 years ago)
- Default Branch: main
- Last Pushed: 2020-10-18T14:59:41.000Z (over 5 years ago)
- Last Synced: 2025-06-11T19:13:04.599Z (12 months ago)
- Topics: es6, es6-javascript, isjs, javascript, javascript-checkers, javascript-ischeck, javascript-istype, javascript-library, javascript-type, javascript-typecheck, js-istype, js-lib, js-library, js-type, jsis, typecheck, typechecker
- Language: JavaScript
- Homepage:
- Size: 18.6 KB
- Stars: 0
- Watchers: 1
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
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README
# JS IS
ES6 JavaScript Type Check Library.
## ⚙️Installation
The preferred way to install this extension is through [NPM][NPM].
$ npm install @varunsridharan/js-is --save-dev
## 🚀 Usage
```javascript
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`
```javascript
import { isNull } from "@varunsridharan/js-is"
isNull( null ); // true
isNull( 42 ); // false
```
### `isObject`
```javascript
import { isObject } from "@varunsridharan/js-is"
isObject( { foo: 'bar' } ); // true
isObject( null ); // false
isObject( 'foo' ); // false
```
### `isArguments`
```javascript
import { isArguments } from "@varunsridharan/js-is"
var getArguments = function() {
return arguments;
};
isArguments( getArguments() ); // true
isArguments( { foo: 'bar' } ); // false
```
### `isArray`
```javascript
import { isArray } from "@varunsridharan/js-is"
isArray( ['foo', 'bar', 'baz'] ); // true
isArray( {foo: 'bar'} ); // false
```
### `isBoolean`
```javascript
import { isBoolean } from "@varunsridharan/js-is"
isBoolean( true ); // true
isBoolean( false ); // true
isBoolean( 'value' ); // false
```
### `isTrue`
```javascript
import { isTrue } from "@varunsridharan/js-is"
isTrue( true ); // true
isTrue( false ); // false
```
### `isFalse`
```javascript
import { isFalse } from "@varunsridharan/js-is"
isFalse( false ); // true
isFalse( true ); // false
```
### `isDate`
```javascript
import { isDate } from "@varunsridharan/js-is"
isDate( new Date() ); // true
isDate( '20/09/2020' ); // false
```
### `isError`
```javascript
import { isError } from "@varunsridharan/js-is"
isError( new Error() ); // true
isError( 'unknown error' ); // false
```
### `isFunction`
```javascript
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`
```javascript
import { isNan } from "@varunsridharan/js-is"
isNan( NaN ); // true
isNan( 1 ); // false
isNan( '1' ); // false
```
### `isNull`
```javascript
import { isNan } from "@varunsridharan/js-is"
isNull( null ); // true
isNull( 1 ); // false
isNull( '1' ); // false
```
### `isNumber`
```javascript
import { isNumber } from "@varunsridharan/js-is"
isNumber( 42 ); // true
isNumber( '42' ); // false
isNumber( NaN ); // false
```
### `isNumeric`
```javascript
import { isNumeric } from "@varunsridharan/js-is"
isNumeric( 42 ); // true
isNumeric( '42' ); // true
isNumeric( NaN ); // false
```
### `isString`
```javascript
import { isNumeric } from "@varunsridharan/js-is"
isNumeric( '42' ); // true
isNumeric( 'your-string' ); // true
isNumeric( 42 ); // false
isNumeric( NaN ); // false
```
### `isUndefined`
```javascript
import { isUndefined } from "@varunsridharan/js-is"
const var2 = 'somevalue';
isUndefined( var1 ); // true
isUndefined( var2 ); // false
isUndefined( 'your-string' ); // false
```
### `isPlainObject`
```javascript
import { isPlainObject } from "@varunsridharan/js-is"
isPlainObject( {} ); // true
isUndefined( var2 ); // false
isUndefined( 'your-string' ); // false
```
### `isWindow`
```javascript
import { isWindow } from "@varunsridharan/js-is"
isWindow( window ); // true
isWindow( document ); // false
```
### `isElement`
```javascript
import { isDocument } from "@varunsridharan/js-is"
isDocument( yourelem ); // true
isDocument( 'window' ); // false
```
### `isDocument`
```javascript
import { isDocument } from "@varunsridharan/js-is"
isDocument( document ); // true
isDocument( window ); // false
```
---
## 📝 Changelog
All notable changes to this project will be documented in this file.
The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
[Checkout CHANGELOG.md](/CHANGELOG.md)
## 🤝 Contributing
If you would like to help, please take a look at the list of [issues](issues/).
## 💰 Sponsor
[I][twitter] fell in love with open-source in 2013 and there has been no looking back since! You can read more about me [here][website].
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**][buymeacoffee]
- ☕️☕️ How about buying me just 2 cups of coffee each month? You can do that for as little as [**$9.99**][buymeacoffee]
- 🔰 We love bettering open-source projects. Support 1-hour of open-source maintenance for [**$24.99 one-time?**][paypal]
- 🚀 Love open-source tools? Me too! How about supporting one hour of open-source development for just [**$49.99 one-time ?**][paypal]
## 📜 License & Conduct
- [**General Public License v3.0 license**](LICENSE) © [Varun Sridharan](website)
- [Code of Conduct](code-of-conduct.md)
## 📣 Feedback
- ⭐ This repository if this project helped you! :wink:
- Create An [🔧 Issue](issues/) if you need help / found a bug
## Connect & Say 👋
- **Follow** me on [👨💻 Github][github] and stay updated on free and open-source software
- **Follow** me on [🐦 Twitter][twitter] to get updates on my latest open source projects
- **Message** me on [📠 Telegram][telegram]
- **Follow** my pet on [Instagram][sofythelabrador] for some _dog-tastic_ updates!
---
Built With ♥ By Varun Sridharan 🇮🇳
---
[paypal]: https://sva.onl/paypal
[buymeacoffee]: https://sva.onl/buymeacoffee
[sofythelabrador]: https://www.instagram.com/sofythelabrador/
[github]: https://sva.onl/github/
[twitter]: https://sva.onl/twitter/
[telegram]: https://sva.onl/telegram/
[email]: https://sva.onl/email
[website]: https://sva.onl/website/
[NPM]: https://npmjs.com