is.js small type testing library for node and the web

  const is = require('is');

  is.Arr([1,2,3,4]) // -> true

  is.Object({ a : 1 , b : 2}) // -> true

  is.eq('string one', 'string one') // ->  true

  is.eq('string two')('string two') // -> true

API

is

is - Type Testing / Assertion main object with all the methods

Alphanumeric

Determine if a String contains only characters and numbers (alphanumeric)

Parameters

• str string variable to test

Args

Tests if a value is an arguments object

Parameters

• variable ...Any to test

Arr

Test if something is an Array

Parameters

• args value/values to test

Array

Array.isArray alias for convenience and performance when only one argument is present

Parameters

• val Any value to test

Arraylike

Test if something is an Array-Like

Parameters

• args value/values to test

Between

Determines whether a Number is between a maximum and a minimum

Parameters

• val Number number value to test
• max Number maximum to compare the value with
• min Number minimum to compare the value with

Returns Boolean wether or not the value is between the max and min

Blob

Determine if a variable is of Blob type

Parameters

• obj variable to test

Bool

Test if something is a boolean type

Parameters

• val value to test

bt

Determines if a number is BIGGER than another

Parameters

• val Number value to test
• other Number num to test with value

bte

Determines if a number is BIGGER than or equal to another

Parameters

• val Number value to test
• other Number num to test with value

Date

Determine if a variable is a Date type

Parameters

• variable ...Any to test

dateString

Determines whether a String is a dateString

Parameters

• dateString string variable to test

Def

Determine whether a variable is in fact defined

Parameters

• args value/values to test

Element

Determine if a variable is a HTMLElement

Parameters

• args value/values to test

Email

Determines whether a String is a valid Email

Parameters

• email string variable to test

empty

Determine if a given collection or string is empty

Parameters

• val (Object|Array|string) value to test if empty

eq

Determines if two variables are equal

Parameters

• a first value to compare
• b second value to compare

even

checks if a number is an even number

Parameters

• val variable / value to test

False

Determine if a variable/s are false

Parameters

• args value/values to test

File

Determine if a variable is a File Object

Parameters

• args value/values to test

FormData

Determine if a variable is of a FormData type

Parameters

• args value/values to test

Func

Determine if a variable is a function

Parameters

• args value/values to test

future

Determines if a date is in the future

Parameters

• obj Date to test

hexadecimal

Determines whether a String is hexadecimal

Parameters

• hexadecimal string variable to test

HexColor

Determines whether a String is a HEX-COLOR (#fff123)

Parameters

• HexColor string variable to test

int

checks if a number is an integer

Parameters

• val variable / value to test

Json

Determine if a sring is JSON

Parameters

• args value/values to test

Lowercase

Determine if a String is LOWERCASE

Parameters

• char string variable to test

lt

Determines if a number is LOWER than another

Parameters

• val Number value to test
• other Number num to test with value

lte

Determines if a number is LOWER than or equal to another

Parameters

• val Number value to test
• other Number num to test with value

Map

Determine if a variable is a Map

Parameters

• args value/values to test

Native

Test if something is a Native JavaScript feature

Parameters

• val value to test

negative

checks if a number is positive

Parameters

• val variable / value to test

Node

Determine whether a variable is a DOM Node

Parameters

• args value/values to test

NodeList

Determine whether a variable is a DOM NodeList or Collection of Nodes

Parameters

• args value/values to test

not

Determines if two variables are equal

Parameters

• a first value to compare
• b second value to compare

Null

Determine whether a variable is null

Parameters

• args value/values to test

Num

Determine if a variable is a Number

Parameters

• args ...Any value/values to test

Object

Determine if a variable is an Object

Parameters

• args value/values to test

odd

checks if a number is an odd number

Parameters

• val variable / value to test

past

Determines if a date is in the past

Parameters

• obj Date to test

positive

checks if a number is positive

Parameters

• val variable / value to test

RegExp

Determine if a variable is a Regular Expression

Parameters

• obj variable to test

Set

Determine if a variable is a Set

Parameters

• obj variable to test

String

Test if something is a String

Parameters

• args value/values to test

Symbol

Determine if a variable is a Symbol

Parameters

• obj variable to test

Tag

Test an element's tagname

Parameters

• element Node node to test
• tag string tag to test node for

time

Determines whether a String is a timeString

Parameters

• time variable to test

today

checks wether a date is today

Parameters

• obj Date to test

tomorrow

checks wether a date is tommorow

Parameters

• obj Date to test

True

Determine if a variable/s are true

Parameters

• args value/values to test

Undef

Determine whether a variable is undefined

Parameters

• args value/values to test

Uppercase

Determine if a String is UPPERCASE

Parameters

• char string variable to test

URL

Determines whether a String is a URL

Parameters

• url string variable to test

yesterday

checks wether a date is yesterday

Parameters

• obj Date to test

root

is.js a small es6 type testing toolkit for the web and node

Meta

• copyright: MIT Licence (c) 2016 Saul van der Walt
• author: github.com/@SaulDoesCode