82 lines
2.0 KiB
JavaScript
82 lines
2.0 KiB
JavaScript
/**
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* @license Apache-2.0
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*
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* Copyright (c) 2018 The Stdlib Authors.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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'use strict';
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// MODULES //
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var hasOwnProp = require( '@stdlib/assert/has-own-property' );
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var toStringTag = require( './tostringtag.js' );
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var toStr = require( './tostring.js' );
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// MAIN //
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/**
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* Returns a string value indicating a specification defined classification of an object in environments supporting `Symbol.toStringTag`.
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*
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* @param {*} v - input value
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* @returns {string} string value indicating a specification defined classification of the input value
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*
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* @example
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* var str = nativeClass( 'a' );
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* // returns '[object String]'
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*
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* @example
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* var str = nativeClass( 5 );
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* // returns '[object Number]'
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*
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* @example
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* function Beep() {
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* return this;
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* }
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* var str = nativeClass( new Beep() );
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* // returns '[object Object]'
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*/
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function nativeClass( v ) {
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var isOwn;
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var tag;
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var out;
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if ( v === null || v === void 0 ) {
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return toStr.call( v );
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}
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tag = v[ toStringTag ];
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isOwn = hasOwnProp( v, toStringTag );
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// Attempt to override the `toStringTag` property. For built-ins having a `Symbol.toStringTag` property (e.g., `JSON`, `Math`, etc), the `Symbol.toStringTag` property is read-only (e.g., , so we need to wrap in a `try/catch`.
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try {
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v[ toStringTag ] = void 0;
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} catch ( err ) { // eslint-disable-line no-unused-vars
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return toStr.call( v );
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}
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out = toStr.call( v );
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if ( isOwn ) {
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v[ toStringTag ] = tag;
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} else {
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delete v[ toStringTag ];
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}
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return out;
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}
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// EXPORTS //
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module.exports = nativeClass;
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