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  • License MIT

the definitive JavaScript type testing library

Package Exports

  • is
  • is/index.js

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

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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)

Symbols

  • is.symbol (value)

BigInts

  • is.bigint (value)

Contributors