@lvchengbin/is

Is

A JavaScript library for checking the type of a value for browsers.

• Installing
• Usage
• Using in browsers
• Method List
  • is.date
  • is.empty
  • is.false
  • is.true

Installing

npm i @lvchengbin/is --save

Usage

Generally, when we are using some toolkit such as rollup, we don't want to compile a huge library into our project, therefore, to import the files you really need.

import isFunction from '@lvchengbin/is/src/function';
import array from '@lvchengbin/is/src/array';

isFunction( async () => {} );
isArray( [] );

If you want to invoke the whole package:

import is from '@lvchengbin/is';

is.function( () => {} );
is.array( [] );

Using in browsers

If you want to invoke this package to browsers with <script> tag or something like that, use is.js. For old browsers which are not supporting ES5 syntax, use is.bc.js.

Method List

Method	Importing
is.arguments	import isArguments from '@lvchengbin/is/src/arguments'
is.array	import isArray from '@lvchengbin/is/src/array'
is.arrowFunction	import isArrowFunction from '@lvchengbin/is/src/arrow-function'
is.asyncFunction	import isAsyncFunction from '@lvchengbin/is/src/async-function'
is.boolean	import isBoolean from '@lvchengbin/is/src/boolean'
is.class	import isClass from '@lvchengbin/is/src/class'
is.date	import isDate from '@lvchengbin/is/src/date'
is.elementNode	import isElementNode from '@lvchengbin/is/src/element-node'
is.email	import isEmail from '@lvchengbin/is/src/email'
is.empty	import isEmpty from '@lvchengbin/is/src/empty'
is.error	import isError from '@lvchengbin/is/src/error'
is.false	import isFalse from '@lvchengbin/is/src/false'
is.fragmentNode	import isFragmentNode from '@lvchengbin/is/src/fragment-node'
is.function	import isFunction from '@lvchengbin/is/src/function'
is.generator	import isGenerator from '@lvchengbin/is/src/generator'
is.integer	import isInteger from '@lvchengbin/is/src/integer'
is.ip	import isIP from '@lvchengbin/is/src/ip'
is.ipv4	import isIPv4 from '@lvchengbin/is/src/ipv4'
is.ipv6	import isIPv6 from '@lvchengbin/is/src/ipv6'
is.iterable	import isIterable from '@lvchengbin/is/src/iterable'
is.leapYear	import isLeapYear from '@lvchengbin/is/src/leap-year'
is.map	import isMap from '@lvchengbin/is/src/map'
is.node	import isNode from '@lvchengbin/is/src/node'
is.number	import isNumber from '@lvchengbin/is/src/number'
is.object	import isObject from '@lvchengbin/is/src/object'
is.oneDimensionalArray	import isOneDimensionalArray from '@lvchengbin/is/src/one-dimensional-array'
is.plainObject	import isPlainObject from '@lvchengbin/is/src/plain-object'
is.promise	import isPromise from '@lvchengbin/is/src/promise'
is.regexp	import isRegexp from '@lvchengbin/is/src/regexp'
is.set	import isSet from '@lvchengbin/is/src/set'
is.string	import isString from '@lvchengbin/is/src/string'
is.true	import isTrue from '@lvchengbin/is/src/true'
is.undefined	import isUndefined from '@lvchengbin/is/src/undefined'
is.url	import isUrl from '@lvchengbin/is/src/url'
is.textNode	import isTextNode from '@lvchengbin/is/src/text-node'
is.window	import isWindow from '@lvchengbin/is/src/window'

is.date

For checking if an object is a Date instance.

import isDate from '@lvchengbin/is/src/date';

isDate( new Date ); // return true

is.empty

an empty value could be am empty object({}), an empty string, an empty array([]), a number 0 or a false |

For checking if a value is empty, and empty values include empty object ({}), empty string (''), empty array ([]), number 0, false.

import isEmpty from '@lvchengbin/is/src/empty';

isEmpty( '' ); // return true
isEmpty( [] ); // return true
isEmpty( {} ); // return true
isEmpty( 0 ); // return true
isEmpty( false ); // return true

is.false

For checking if a value is false, if the second argument is true (by default), the function will check a generalized false, it means that the following strings all mean false: "false", "no", "0", "", "nay", "n", "disagree".

import isFalse from '@lvchengbin/is/src/false';

isFalse( false ); // returns true
isFalse( 'false' ); // returns true
isFalse( 'false', false ); // returns false

is.true

For checking if a value is true, if the second argument is true (by default), the function will check a generalized true, it means that the following strings all mean true: "true", "true", "yes", "ok", "1", "yea", "yep", "y", "agree".

import isTrue from '@lvchengbin/is/src/true';
isTrue( true ); // returns true
isTrue( 'true' ); // returns true
isTrue( 'true', false ); // returns false