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@varunsridharan/js-is

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  • License MIT

ES6 Javascript Typecheck Library

Package Exports

  • @varunsridharan/js-is

This package does not declare an exports field, so the exports above have been automatically detected and optimized by JSPM instead. If any package subpath is missing, it is recommended to post an issue to the original package (@varunsridharan/js-is) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

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

📝 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

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📜 License & Conduct

📣 Feedback

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

Connect & Say 👋

Built With ♥ By Varun Sridharan 🇮🇳