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