73 lines
1.7 KiB
JavaScript
73 lines
1.7 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 isFunction = require( '@stdlib/assert/is-function' );
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var hasFunctionNameSupport = require( '@stdlib/assert/has-function-name-support' );
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var RE = require( '@stdlib/regexp/function-name' ).REGEXP;
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// VARIABLES //
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var isFunctionNameSupported = hasFunctionNameSupport();
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// MAIN //
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/**
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* Returns the name of a function.
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*
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* @param {Function} fcn - input function
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* @throws {TypeError} must provide a function
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* @returns {string} function name
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*
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* @example
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* var v = functionName( Math.sqrt );
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* // returns 'sqrt'
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*
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* @example
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* var v = functionName( function foo(){} );
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* // returns 'foo'
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*
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* @example
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* var v = functionName( function(){} );
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* // returns '' || 'anonymous'
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*
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* @example
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* var v = functionName( String );
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* // returns 'String'
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*/
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function functionName( fcn ) {
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// TODO: add support for generator functions?
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if ( isFunction( fcn ) === false ) {
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throw new TypeError( 'invalid argument. Must provide a function. Value: `' + fcn + '`.' );
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}
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if ( isFunctionNameSupported ) {
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return fcn.name;
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}
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return RE.exec( fcn.toString() )[ 1 ];
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}
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// EXPORTS //
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module.exports = functionName;
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