81 lines
1.8 KiB
JavaScript
81 lines
1.8 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 nativeClass = require( './../../native-class' );
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var RE = require( '@stdlib/regexp/function-name' ).REGEXP;
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var isBuffer = require( '@stdlib/assert/is-buffer' );
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// MAIN //
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/**
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* Determines the name of a value's constructor.
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*
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* @param {*} v - input value
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* @returns {string} name of a value's constructor
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*
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* @example
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* var v = constructorName( 'a' );
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* // returns 'String'
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*
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* @example
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* var v = constructorName( 5 );
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* // returns 'Number'
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*
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* @example
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* var v = constructorName( null );
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* // returns 'Null'
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*
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* @example
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* var v = constructorName( undefined );
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* // returns 'Undefined'
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*
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* @example
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* var v = constructorName( function noop() {} );
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* // returns 'Function'
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*/
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function constructorName( v ) {
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var match;
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var name;
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var ctor;
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name = nativeClass( v ).slice( 8, -1 );
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if ( (name === 'Object' || name === 'Error') && v.constructor ) {
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ctor = v.constructor;
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if ( typeof ctor.name === 'string' ) {
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return ctor.name;
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}
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match = RE.exec( ctor.toString() );
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if ( match ) {
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return match[ 1 ];
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}
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}
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if ( isBuffer( v ) ) {
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return 'Buffer';
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}
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return name;
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}
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// EXPORTS //
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module.exports = constructorName;
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