es-is

es-is

ES Module friendly fork of the definitive JavaScript type testing library.

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

Note about importing modules

Due to limitations with bundlers, rather than import {isFunction} from 'es-is' it's recommended that you import from module directly: import isFunction from 'es-is/function. Hopefully as tree-shaking becomes more sophisticated, this will become unnecessary.

Installation

As a node.js module

$ npm install is

As a component

$ component install zeekay/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

• Jordan Harband