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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 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;
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