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type-detect

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type-detect

Improved typeof detection for node.js and the browser.

    4.0.8latest

Version published
Maintainers
1
Weekly downloads
18,474,595
decreased by-3.07%

Weekly downloads

Changelog

Source

v4.0.8

<a name="4.0.8"></a>

4.0.8 (2018-02-01)

Bug Fixes

  • Extra null check since typeof null = object, however null.location throws an error (9f492ab)

Readme

Source

ChaiJS type-detect


Improved typeof detection for node and the browser.

license:mit tag:? build:? coverage:? npm:? dependencies:? devDependencies:?

Supported Browsers
Chrome Edge Firefox Safari IE
9, 10, 11

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What is Type-Detect?

Type Detect is a module which you can use to detect the type of a given object. It returns a string representation of the object's type, either using typeof or @@toStringTag. It also normalizes some object names for consistency among browsers.

Why?

The typeof operator will only specify primitive values; everything else is "object" (including null, arrays, regexps, etc). Many developers use Object.prototype.toString() - which is a fine alternative and returns many more types (null returns [object Null], Arrays as [object Array], regexps as [object RegExp] etc).

Sadly, Object.prototype.toString is slow, and buggy. By slow - we mean it is slower than typeof. By buggy - we mean that some values (like Promises, the global object, iterators, dataviews, a bunch of HTML elements) all report different things in different browsers.

type-detect fixes all of the shortcomings with Object.prototype.toString. We have extra code to speed up checks of JS and DOM objects, as much as 20-30x faster for some values. type-detect also fixes any consistencies with these objects.

Installation

Node.js

type-detect is available on npm. To install it, type:

$ npm install type-detect

Browsers

You can also use it within the browser; install via npm and use the type-detect.js file found within the download. For example:

<script src="./node_modules/type-detect/type-detect.js"></script>

Usage

The primary export of type-detect is function that can serve as a replacement for typeof. The results of this function will be more specific than that of native typeof.

var type = require('type-detect');
array
assert(type([]) === 'Array'); assert(type(new Array()) === 'Array');
regexp
assert(type(/a-z/gi) === 'RegExp'); assert(type(new RegExp('a-z')) === 'RegExp');
function
assert(type(function () {}) === 'function');
arguments
(function () { assert(type(arguments) === 'Arguments'); })();
date
assert(type(new Date) === 'Date');
number
assert(type(1) === 'number'); assert(type(1.234) === 'number'); assert(type(-1) === 'number'); assert(type(-1.234) === 'number'); assert(type(Infinity) === 'number'); assert(type(NaN) === 'number'); assert(type(new Number(1)) === 'Number'); // note - the object version has a capital N
string
assert(type('hello world') === 'string'); assert(type(new String('hello')) === 'String'); // note - the object version has a capital S
null
assert(type(null) === 'null'); assert(type(undefined) !== 'null');
undefined
assert(type(undefined) === 'undefined'); assert(type(null) !== 'undefined');
object
var Noop = function () {}; assert(type({}) === 'Object'); assert(type(Noop) !== 'Object'); assert(type(new Noop) === 'Object'); assert(type(new Object) === 'Object');
ECMA6 Types

All new ECMAScript 2015 objects are also supported, such as Promises and Symbols:

assert(type(new Map() === 'Map'); assert(type(new WeakMap()) === 'WeakMap'); assert(type(new Set()) === 'Set'); assert(type(new WeakSet()) === 'WeakSet'); assert(type(Symbol()) === 'symbol'); assert(type(new Promise(callback) === 'Promise'); assert(type(new Int8Array()) === 'Int8Array'); assert(type(new Uint8Array()) === 'Uint8Array'); assert(type(new UInt8ClampedArray()) === 'Uint8ClampedArray'); assert(type(new Int16Array()) === 'Int16Array'); assert(type(new Uint16Array()) === 'Uint16Array'); assert(type(new Int32Array()) === 'Int32Array'); assert(type(new UInt32Array()) === 'Uint32Array'); assert(type(new Float32Array()) === 'Float32Array'); assert(type(new Float64Array()) === 'Float64Array'); assert(type(new ArrayBuffer()) === 'ArrayBuffer'); assert(type(new DataView(arrayBuffer)) === 'DataView');

Also, if you use Symbol.toStringTag to change an Objects return value of the toString() Method, type() will return this value, e.g:

var myObject = {}; myObject[Symbol.toStringTag] = 'myCustomType'; assert(type(myObject) === 'myCustomType');

Keywords

FAQs

What is type-detect?

Improved typeof detection for node.js and the browser.

Is type-detect popular?

The npm package type-detect receives a total of 15,028,950 weekly downloads. As such, type-detect popularity was classified as popular.

Is type-detect well maintained?

We found that type-detect demonstrated a not healthy version release cadence and project activity because the last version was released a year ago.It has 1 open source maintainer collaborating on the project.

Last updated on 01 Feb 2018
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