/** * @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 isString = require( '@stdlib/assert-is-string' ); var isnan = require( '@stdlib/assert-is-nan' ).isPrimitive; var isInteger = require( '@stdlib/assert-is-integer' ).isPrimitive; var isEnum = require( './native.js' ); var hasStringEnumBug = require( './has_string_enumerability_bug.js' ); // MAIN // /** * Tests if an object's own property is enumerable. * * @param {*} value - value to test * @param {*} property - property to test * @returns {boolean} boolean indicating if an object property is enumerable * * @example * var beep = { * 'boop': true * }; * * var bool = isEnumerableProperty( beep, 'boop' ); * // returns true * * @example * var beep = { * 'boop': true * }; * * var bool = isEnumerableProperty( beep, 'hasOwnProperty' ); * // returns false */ function isEnumerableProperty( value, property ) { var bool; if ( value === void 0 || value === null ) { return false; } bool = isEnum.call( value, property ); if ( !bool && hasStringEnumBug && isString( value ) ) { // Note: we only check for indices, as properties attached to a `String` object are properly detected as enumerable above. property = +property; return ( !isnan( property ) && isInteger( property ) && property >= 0 && property < value.length ); } return bool; } // EXPORTS // module.exports = isEnumerableProperty;