is-funcs

is-funcs

A very limited subset of is-* functions I use every day

Install

npm i is-funcs

Package on npm

API

• is-array-filled
• is-boolean
• is-buffer
• is-date
• is-date-string
• is-float
• is-function
• is-gt
• is-gte
• is-integer
• is-lt
• is-lte
• is-nan
• is-node
• is-node-landed
• is-number-defined
• is-number-string
• is-object
• is-plain-object
• is-regexp
• is-string-filled

is-array-filled(data)

Check if data is an Array and is length is > 0

Argument	Action
data	the tested data

const isArrayFilled = require('is-funcs/is-array-filled')

// false
isArrayFilled({a:1})

// true
isArrayFilled(['a'])

// false
isArrayFilled([])

is-boolean(data)

Check if data is a Boolean

Argument	Action
data	the tested data

const isBoolean = require('is-funcs/is-boolean')

// false
isBoolean({a:1})

// true
isBoolean(true)

// true
isBoolean(false)

is-buffer(data)

Check if data is a node Buffer

Argument	Action
data	the tested data

const isBuffer = require('is-funcs/is-buffer')

// false
isBuffer([1])

// false
isBuffer(Buffer)

// true
isBuffer(Buffer.from('abc'))

is-date(data)

Check if data is a valid instance of new Date

Argument	Action
data	the tested data

const isDate = require('is-funcs/is-date')

// true
isDate(new Date())

// false, invalid date
isDate(new Date('-'))

// false
isDate('2000-01-01')

// false
isDate(2010)

is-date-string(data)

Check if data is a valid date string representation

Argument	Action
data	the tested data

Date string validation is a nightmare. The browsers have differents behaviors

This function validates the patterns that return a correct date in the following case

// valid date
console.log(new Date(string))

Valid patterns are:

• YYYY/M/D and YYYY-M-D
• YYYY/MM/DD and YYYY-MM-DD
• YYYY/M/D H:M and YYYY-M-D H:M
• YYYY/M/D HH:MM and YYYY-M-D HH:MM
• YYYY/M/D H:M:S and YYYY-M-D H:M:S
• YYYY/M/D HH:MM:SS and YYYY-M-D HH:MM:SS
• YYYY-M-DTHH:MM:SSZ and YYYY-M-DTHH:MM:SS.LLLZ

This function also test the date validity:

• No 29 february if this is not a leap year
• No 31 april

const isDateString = require('is-funcs/is-date-string')

// true
isDateString('2009-01-31')

// true
isDateString('2009-12-31T12:34:56.789Z')

// false, because invalid iso date
isDateString('2009-12-3T12:34:56.789Z')

// false, because april has 30 days
isDateString('2015-04-31')

// false, because 2015 is not a leap year
isDateString('2015-02-29')

is-float(data)

Check if data is a Float Number

Argument	Action
data	the tested data

const isFloat = require('is-funcs/is-float')

// false
isFloat('abc')

// false
isFloat(12)

// true
isFloat(12.3)

/*
  Attention: Javascript returns wrong results with extreme values
*/
// true
isFloat(12345678900)

// false
isFloat(1000.00000000000001)

is-function(data)

Check if data is a Function defined by the developper. Standard built-in objects are excluded

Use it if you really need this full test, otherwise just write typeof data === 'function'

const isFunction = require('is-funcs/is-function')

// true
isFunction(function() {})

// false
isFunction(Function)

// false
isFunction(Promise)

// false
isFunction(isNaN)

is-gt(data, than)

Check if data is a greater than than

Argument	Action
data	the tested data
than	the reference than

const isGt = require('is-funcs/is-gt')

// true
isGt(2, 1)

// false
isGt(2, 3)

is-gte(data, than)

Check if data is a greater or equal than than

Argument	Action
data	the tested data
than	the reference than

const isGte = require('is-funcs/is-gte')

// true
isGte(3, 2)

// true
isGte(2, 2)

// false
isGte(2, 3)

is-integer(data)

Check if data is an Integer Number

Argument	Action
data	the tested data

const isInteger = require('is-funcs/is-integer')

// true
isInteger(2)

// false
isInteger(2.34)

/*
  Attention: Javascript returns wrong results with extreme values
*/
// false
isInteger(12345678900)

// true
isInteger(100.000000000000001)

is-lt(data, than)

Check if data is a lower than than

Argument	Action
data	the tested data
than	the reference than

const isLt = require('is-funcs/is-lt')

// true
isLt(1, 2)

// false
isLt(3, 2)

is-lte(data, than)

Check if data is a lower or equal than than

Argument	Action
data	the tested data
than	the reference than

const isLte = require('is-funcs/is-lte')

// true
isLte(1, 2)

// true
isLte(2, 2)

// false
isLte(3, 2)

is-nan(data)

Check if data is a real NaN Number

Argument	Action
data	the tested data

const isnan = require('is-funcs/is-nan')

// true
isnan(NaN)

// true
isnan(-NaN)

// false
isnan('abc')

// default isNaN return true
isNaN('abc')

is-node(data)

Check if data is a Html Element with a nodeType of 1

Argument	Action
data	the tested data

const isNode = require('is-funcs/is-node')

// true
isNode(document.querySelector('div'))

// true
isNode(document.createElement('div'))

is-node-landed(data)

Check if data is a visual Html Element with a nodeType of 1 landed in the document.body

Elements like style or script are excluded

Argument	Action
data	the tested data

const isNodeLanded = require('is-funcs/is-node-landed')

// true
isNodeLanded(document.querySelector('div'))

// false
var div = document.createElement('div')
isNodeLanded(div)

// true
document.body.appendChild(div)
isNodeLanded(div)

is-number-defined(data)

Check if data is a defined Number, not equals to NaN

Argument	Action
data	the tested data

const isNumberDefined = require('is-funcs/is-number-defined')

// true
isNumberDefined(1)

// true
isNumberDefined(2.34)

// false
isNumberDefined(NaN)

// false
isNumberDefined([1])

is-number-string(data)

Check if data is a valid number string representation

Argument	Action
data	the tested data

This function validates the patterns that return a correct number in the following case

// valid number
console.log(parseFloat(string))

const isNumberString = require('is-funcs/is-number-string')

// true
isNumberString('1')

// true
isNumberString('.34')

// true
isNumberString(' -2.34 ')

// true
isNumberString('NaN')

// false
isNumberString('1.23.45')

// false
isNumberString('abc')

// false
isNumberString(12.3)

is-object(data)

Simplest and fastest way to check if data is an Object

We just wants to know if data is an object where we can define a property, excluding Functions

Technically functions should be true but what we want here is just a not so exact but quick test to know if data is like a Plain Object

See is-plain-object for stricter but slower object test

Argument	Action
data	the tested data

const isObject = require('is-funcs/is-object')

// true
isObject({})

// true
isObject([])

// true
isObject(arguments)

// true, typeof Math JSON Reflect Intl and WebAssembly is "object"
isObject(JSON)

// false
isObject(Number)

// false
isObject(function() {})

is-plain-object(data)

Check if data is a Plain Object

Argument	Action
data	the tested data

const isPlainObject = require('is-funcs/is-plain-object')

// true
isPlainObject({a:1})

// true
isPlainObject({})

// false
isPlainObject(arguments)

// false
isPlainObject([1])

// false
isPlainObject(JSON)

is-regexp(data)

Check if data is a RegExp

const isRegexp = require('is-funcs/is-regexp')

// false
isRegexp(true)

// false
isRegexp('/./')

// true
isRegexp(/./)

// true
isRegexp(new RegExp('/./'))

is-string-filled(data)

Check if data is an String and his trimmed length is > 0

All possible unicode blank chars are trimmed

Argument	Action
data	the tested data

const isStringFilled = require('is-funcs/is-string-filled')

// true
isStringFilled('abc')

// false
isStringFilled('')

// false
isStringFilled('  ')

// false
isStringFilled(' \u0020 \u180E \u200B ')

// false
isStringFilled({a:1})

License

MIT