58 lines
1.2 KiB
JavaScript
58 lines
1.2 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 toStr = require( './tostring.js' );
|
|
|
|
|
|
// VARIABLES //
|
|
|
|
var RE = /^Symbol\(.*\)$/;
|
|
|
|
|
|
// MAIN //
|
|
|
|
/**
|
|
* Attempts to call a `Symbol` method.
|
|
*
|
|
* @private
|
|
* @param {*} value - value to test
|
|
* @returns {boolean} boolean indicating if able to call a `Symbol` method
|
|
*/
|
|
function test( value ) {
|
|
try {
|
|
return (
|
|
// Objects created via `Object.create( null )` have no `valueOf()` method:
|
|
typeof value.valueOf() === 'symbol' &&
|
|
|
|
// Test output of a non-generic method:
|
|
RE.test( toStr( value ) )
|
|
);
|
|
} catch ( err ) { // eslint-disable-line no-unused-vars
|
|
return false;
|
|
}
|
|
}
|
|
|
|
|
|
// EXPORTS //
|
|
|
|
module.exports = test;
|