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  • License MIT

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

Package Exports

  • is-funcs/is-array
  • is-funcs/is-boolean
  • is-funcs/is-date
  • is-funcs/is-gte
  • is-funcs/is-nan
  • is-funcs/is-node
  • is-funcs/is-number
  • is-funcs/is-object
  • is-funcs/is-regexp
  • is-funcs/is-string

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 (is-funcs) to support the "exports" field. If that is not possible, create a JSPM override to customize the exports field for this package.

Readme

is-funcs

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

Install

npm i is-funcs

Package on npm

API

is-array(data, [filled])

Check if data is an Array

Argument Action
data the tested data
filled optional filled, default to false. If true, check length is > 0 
const isarray = require('is-funcs/is-array')

// false
isarray({a:1})

// true
isarray(['a'])

// true
isarray([])

// false
isarray([], true)

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 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, invalid iso date
isdatestring('2009-12-3T12:34:56.789Z')

// false april has 30 days
isdatestring('2015-04-31')

// false 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)

is-function(data)

Check if data is a Function

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

// false
isfunction(12.3)

// true
isfunction(function() {})

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 than or equal 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)

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 than or equal 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)

// false
isnan('abc')

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

is-node(data, [check])

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

Argument Action
data the tested data
check optional check, default to false. If true, the following tests are done

If check is true

  • check if data is landed in the document.body
  • check if data is a visula element. Elements like style or script are excluded
const isnode = require('is-funcs/is-node')

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

// false
isnode(document.createElement('div'), true)

var div = document.createElement('div')
document.body.appendChild(div)
// true
isnode(div, true)

is-number(data)

Check if data is a Number, not equals to NaN

Argument Action
data the tested data 
const isnumber = require('is-funcs/is-number')

// false
isnumber([1])

// true
isnumber(1)

// true
isnumber(2.34)

// false
isnumber(NaN)

is-object(data, [filled])

Check if data is an Plain Object

Argument Action
data the tested data
filled optional filled, default to false. If true, check if data has at least 1 key

note: function arguments is evaluted as plain object.

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

// false
isobject([1])

// true
isobject({a:1})

// true
isobject({})

// false
isObject({}, true)

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(data, [filled])

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

Argument Action
data the tested data
filled optional filled, default to false. If true, check if data trimmed length is > 0 
const isstring = require('is-funcs/is-string')

// false
isstring({a:1})

// true
isstring('abc')

// true
isstring('')

// true
isString('  ')

// false
isstring('  ', true)

License

MIT