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@stdlib/utils-type-of

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@stdlib/utils-type-of

Determine a value's type.

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About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please consider financially supporting stdlib. We greatly appreciate your continued support!

typeOf

NPM version Build Status Coverage Status

Determine a value's type.

Installation

npm install @stdlib/utils-type-of

Usage

var typeOf = require( '@stdlib/utils-type-of' );
typeOf( value )

Returns a value's type.

var str = typeOf( 'a' );
// returns 'string'

str = typeOf( 5 );
// returns 'number'
descriptionvaluetypenotes
string'beep''string'
number5'number'
NaNNaN'number'
infinity+infinity/-infinity'number'
booleantrue/false'boolean'
nullnull'null'
undefinedundefined'undefined'
array['beep', 5]'array'
object{'foo': 'bar'}'object'
functionfunction (){}'function'
symbolSymbol()'symbol'ES2015
regexp/./'regexp'Android 4.1+
Stringnew String('beep')'string'
Numbernew Number(5)'number'
Booleannew Boolean(false)'boolean'
Objectnew Object()'object'
Arraynew Array()'array'
Int8Arraynew Int8Array()'int8array'
Uint8Arraynew Uint8Array()'uint8array'
Uint8ClampedArraynew Uint8ClampedArray()'uint8clampedarray'
Int16Arraynew Int16Array()'int16array'
Uint16Arraynew Uint16Array()'uint16array'
Int32Arraynew Int32Array()'int32array'
Uint32Arraynew Uint32Array()'uint32array'
Float32Arraynew Float32Array()'float32array'
Float64Arraynew Float64Array()'float64array'
ArrayBuffernew ArrayBuffer()'arraybuffer'
Buffernew Buffer()'buffer'Node.js
Datenew Date()'date'
RegExpnew RegExp('.')'regexp'Android 4.1+
Functionnew Function('x', 'return x')'function'
Mapnew Map()'map'ES2015
WeakMapnew WeakMap()'weakmap'ES2015
Setnew Set()'set'ES2015
WeakSetnew WeakSet()'weakset'ES2015
Errornew Error()'error'
TypeErrornew TypeError()'typeerror'
SyntaxErrornew SyntaxError()'syntaxerror'
ReferenceErrornew ReferenceError()'referenceerror'
URIErrornew URIError()'urierror'
RangeErrornew RangeError()'rangeerror'
EvalErrornew EvalError()'evalerror'
MathMath'math'
JSONJSON'json'IE8+
arguments(function(){return arguments;})()'arguments'IE9+
custom constructornew Beep()'beep'
anonymous constructornew (function(){})()''

Examples

var Float32Array = require( '@stdlib/array-float32' );
var Float64Array = require( '@stdlib/array-float64' );
var Int8Array = require( '@stdlib/array-int8' );
var Int16Array = require( '@stdlib/array-int16' );
var Int32Array = require( '@stdlib/array-int32' );
var Uint8Array = require( '@stdlib/array-uint8' );
var Uint8ClampedArray = require( '@stdlib/array-uint8c' );
var Uint16Array = require( '@stdlib/array-uint16' );
var Uint32Array = require( '@stdlib/array-uint32' );
var ArrayBuffer = require( '@stdlib/array-buffer' );
var Symbol = require( '@stdlib/symbol-ctor' );
var typeOf = require( '@stdlib/utils-type-of' );

var str = typeOf( 'a' );
// returns 'string'

str = typeOf( 5 );
// returns 'number'

str = typeOf( NaN );
// returns 'number'

str = typeOf( Infinity );
// returns 'number'

str = typeOf( true );
// returns 'boolean'

str = typeOf( false );
// returns 'boolean'

str = typeOf( void 0 );
// returns 'undefined'

str = typeOf( null );
// returns 'null'

str = typeOf( [] );
// returns 'array'

str = typeOf( {} );
// returns 'object'

str = typeOf( function noop() {} );
// returns 'function'

str = typeOf( new Map() );
// returns 'map'

str = typeOf( new WeakMap() );
// returns 'weakmap'

str = typeOf( new Set() );
// returns 'set'

str = typeOf( new WeakSet() );
// returns 'weakset'

str = typeOf( Symbol( 'beep' ) );
// returns 'symbol'

str = typeOf( new Error( 'beep' ) );
// returns 'error'

str = typeOf( new TypeError( 'beep' ) );
// returns 'typeerror'

str = typeOf( new SyntaxError( 'beep' ) );
// returns 'syntaxerror'

str = typeOf( new ReferenceError( 'beep' ) );
// returns 'referenceerror'

str = typeOf( new URIError( 'beep' ) );
// returns 'urierror'

str = typeOf( new EvalError( 'beep' ) );
// returns 'evalerror'

str = typeOf( new RangeError( 'beep' ) );
// returns 'rangeerror'

str = typeOf( new Date() );
// returns 'date'

str = typeOf( /./ );
// returns 'regexp'

str = typeOf( Math );
// returns 'math'

str = typeOf( JSON );
// returns 'json'

str = typeOf( new Int8Array( 10 ) );
// returns 'int8array'

str = typeOf( new Uint8Array( 10 ) );
// returns 'uint8array'

str = typeOf( new Int16Array( 10 ) );
// returns 'int16array'

str = typeOf( new Uint16Array( 10 ) );
// returns 'uint16array'

str = typeOf( new Int32Array( 10 ) );
// returns 'int32array'

str = typeOf( new Uint32Array( 10 ) );
// returns 'uint32array'

str = typeOf( new Float32Array( 10 ) );
// returns 'float32array'

str = typeOf( new Float64Array( 10 ) );
// returns 'float64array'

str = typeOf( new ArrayBuffer( 10 ) );
// returns 'arraybuffer'

function Person1() {
    return this;
}
str = typeOf( new Person1() );
// returns 'person1'

var Person2 = function () {
    return this;
};
str = typeOf( new Person2() );
// returns ''

See Also


Notice

This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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License

See LICENSE.

Copyright © 2016-2024. The Stdlib Authors.

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Package last updated on 27 Jul 2024

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