Native Class
Determine the specification defined classification of an object.
Installation
npm install @stdlib/utils-native-class
Usage
var nativeClass = require( '@stdlib/utils-native-class' );
nativeClass( value )
Returns a string
value indicating a specification defined classification of an object
.
var str = nativeClass( 'a' );
str = nativeClass( 5 );
function Beep() {
return this;
}
str = nativeClass( new Beep() );
Notes
-
The function is not robust for ES2015+ environments. In ES2015+, Symbol.toStringTag
allows overriding the default description of an object.
var toStr = Object.prototype.toString;
var str = toStr.call( false );
var o = {};
str = toStr.call( o );
o[ Symbol.toStringTag ] = 'Boolean';
str = toStr.call( o );
While measures are taken to uncover the default description, such measures can be thwarted. While this function remains useful for type-checking, be aware that value impersonation is possible. Prefer functions tailored to checking for particular value types, as specialized functions are better equipped to address Symbol.toStringTag
.
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 nativeClass = require( '@stdlib/utils-native-class' );
var str = nativeClass( 'a' );
str = nativeClass( 5 );
str = nativeClass( NaN );
str = nativeClass( null );
str = nativeClass( void 0 );
str = nativeClass( true );
str = nativeClass( false );
str = nativeClass( {} );
str = nativeClass( [] );
str = nativeClass( function noop() {} );
str = nativeClass( /./ );
str = nativeClass( new Date() );
str = nativeClass( new Map() );
str = nativeClass( new WeakMap() );
str = nativeClass( new Set() );
str = nativeClass( new WeakSet() );
str = nativeClass( Symbol( 'beep' ) );
str = nativeClass( new Error() );
str = nativeClass( new TypeError() );
str = nativeClass( new SyntaxError() );
str = nativeClass( new URIError() );
str = nativeClass( new RangeError() );
str = nativeClass( new ReferenceError() );
str = nativeClass( new EvalError() );
str = nativeClass( new Int8Array() );
str = nativeClass( new Uint8Array() );
str = nativeClass( new Uint8ClampedArray() );
str = nativeClass( new Int16Array() );
str = nativeClass( new Uint16Array() );
str = nativeClass( new Int32Array() );
str = nativeClass( new Uint32Array() );
str = nativeClass( new Float32Array() );
str = nativeClass( new Float64Array() );
str = nativeClass( new ArrayBuffer() );
str = nativeClass( Math );
str = nativeClass( JSON );
function Person() {
return this;
}
str = nativeClass( new Person() );
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.
License
See LICENSE.
Copyright
Copyright © 2016-2022. The Stdlib Authors.