A few seconds.

is

the definitive JavaScript type testing library

is Version Badge

Build Status dependency status dev dependency status License Downloads

npm badge

browser support

The definitive JavaScript type testing library

To be or not to be? This is the library!

Installation

As a node.js module

$ npm install is

As a component

$ component install enricomarino/is

API

general

  • is.a (value, type) or is.type (value, type)
  • is.defined (value)
  • is.empty (value)
  • is.equal (value, other)
  • is.hosted (value, host)
  • is.instance (value, constructor)
  • is.instanceof (value, constructor) - deprecated, because in ES3 browsers, "instanceof" is a reserved word
  • is.nil (value)
  • is.null (value) - deprecated, because in ES3 browsers, "null" is a reserved word
  • is.undef (value)
  • is.undefined (value) - deprecated, because in ES3 browsers, "undefined" is a reserved word

arguments

  • is.args (value)
  • is.arguments (value) - deprecated, because "arguments" is a reserved word
  • is.args.empty (value)

array

  • is.array (value)
  • is.array.empty (value)
  • is.arraylike (value)

boolean

  • is.bool (value)
  • is.boolean (value) - deprecated, because in ES3 browsers, "boolean" is a reserved word
  • is.false (value) - deprecated, because in ES3 browsers, "false" is a reserved word
  • is.true (value) - deprecated, because in ES3 browsers, "true" is a reserved word

date

  • is.date (value)

element

  • is.element (value)

error

  • is.error (value)

function

  • is.fn (value)
  • is.function (value) - deprecated, because in ES3 browsers, "function" is a reserved word

number

  • is.number (value)
  • is.infinite (value)
  • is.decimal (value)
  • is.divisibleBy (value, n)
  • is.integer (value)
  • is.int (value) - deprecated, because in ES3 browsers, "int" is a reserved word
  • is.maximum (value, others)
  • is.minimum (value, others)
  • is.nan (value)
  • is.even (value)
  • is.odd (value)
  • is.ge (value, other)
  • is.gt (value, other)
  • is.le (value, other)
  • is.lt (value, other)
  • is.within (value, start, finish)

object

  • is.object (value)

regexp

  • is.regexp (value)

string

  • is.string (value)

encoded binary

  • is.base64 (value)
  • is.hex (value)

ES6 Symbols

  • is.symbol (value)

Contributors

Pincer is a project which aims to provide best library discovery tools for developers. We're growing day by day. We have only npm platform for now but we will add the others as much as we can.