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* @license Apache-2.0
*
* Copyright (c) 2018 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var isFunction = require( '@stdlib/assert/is-function' );
var hasFunctionNameSupport = require( '@stdlib/assert/has-function-name-support' );
var format = require( '@stdlib/string/format' );
var RE = require( '@stdlib/regexp/function-name' ).REGEXP;
// VARIABLES //
var isFunctionNameSupported = hasFunctionNameSupport();
// MAIN //
/**
* Returns the name of a function.
*
* @param {Function} fcn - input function
* @throws {TypeError} must provide a function
* @returns {string} function name
*
* @example
* var v = functionName( Math.sqrt );
* // returns 'sqrt'
*
* @example
* var v = functionName( function foo(){} );
* // returns 'foo'
*
* @example
* var v = functionName( function(){} );
* // returns '' || 'anonymous'
*
* @example
* var v = functionName( String );
* // returns 'String'
*/
function functionName( fcn ) {
// TODO: add support for generator functions?
if ( isFunction( fcn ) === false ) {
throw new TypeError( format( 'invalid argument. Must provide a function. Value: `%s`.', fcn ) );
}
if ( isFunctionNameSupported ) {
return fcn.name;
}
return RE.exec( fcn.toString() )[ 1 ];
}
// EXPORTS //
module.exports = functionName;
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