73 lines
1.7 KiB
JavaScript
73 lines
1.7 KiB
JavaScript
|
/**
|
||
|
|
* @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 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( 'invalid argument. Must provide a function. Value: `' + fcn + '`.' );
|
||
|
|
}
|
||
|
|
if ( isFunctionNameSupported ) {
|
||
|
|
return fcn.name;
|
||
|
|
}
|
||
|
|
return RE.exec( fcn.toString() )[ 1 ];
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = functionName;
|