103 lines
2.9 KiB
JavaScript
103 lines
2.9 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 isObjectLike = require( '@stdlib/assert/is-object-like' );
|
||
|
|
var hasOwnProp = require( '@stdlib/assert/has-own-property' );
|
||
|
|
var isArguments = require( '@stdlib/assert/is-arguments' );
|
||
|
|
var HAS_ENUM_PROTO_BUG = require( './has_enumerable_prototype_bug.js' );
|
||
|
|
var HAS_NON_ENUM_PROPS_BUG = require( './has_non_enumerable_properties_bug.js' );
|
||
|
|
var isConstructorPrototype = require( './is_constructor_prototype_wrapper.js' );
|
||
|
|
var NON_ENUMERABLE = require( './non_enumerable.json' );
|
||
|
|
|
||
|
|
|
||
|
|
// MAIN //
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns an array of an object's own enumerable property names.
|
||
|
|
*
|
||
|
|
* @private
|
||
|
|
* @param {*} value - input object
|
||
|
|
* @returns {Array} a list of own enumerable property names
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* var obj = {
|
||
|
|
* 'beep': 'boop',
|
||
|
|
* 'foo': 3.14
|
||
|
|
* };
|
||
|
|
*
|
||
|
|
* var k = keys( obj );
|
||
|
|
* // e.g., returns [ 'beep', 'foo' ]
|
||
|
|
*/
|
||
|
|
function keys( value ) {
|
||
|
|
var skipConstructor;
|
||
|
|
var skipPrototype;
|
||
|
|
var isFcn;
|
||
|
|
var out;
|
||
|
|
var k;
|
||
|
|
var p;
|
||
|
|
var i;
|
||
|
|
|
||
|
|
out = [];
|
||
|
|
if ( isArguments( value ) ) {
|
||
|
|
// Account for environments which treat `arguments` differently...
|
||
|
|
for ( i = 0; i < value.length; i++ ) {
|
||
|
|
out.push( i.toString() );
|
||
|
|
}
|
||
|
|
// Note: yes, we are precluding the `arguments` array-like object from having other enumerable properties; however, this should (1) be very rare and (2) not be encouraged (e.g., doing something like `arguments.a = 'b'`; in certain engines directly manipulating the `arguments` value results in automatic de-optimization).
|
||
|
|
return out;
|
||
|
|
}
|
||
|
|
if ( typeof value === 'string' ) {
|
||
|
|
// Account for environments which do not treat string character indices as "own" properties...
|
||
|
|
if ( value.length > 0 && !hasOwnProp( value, '0' ) ) {
|
||
|
|
for ( i = 0; i < value.length; i++ ) {
|
||
|
|
out.push( i.toString() );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
} else {
|
||
|
|
isFcn = ( typeof value === 'function' );
|
||
|
|
if ( isFcn === false && !isObjectLike( value ) ) {
|
||
|
|
return out;
|
||
|
|
}
|
||
|
|
skipPrototype = ( HAS_ENUM_PROTO_BUG && isFcn );
|
||
|
|
}
|
||
|
|
for ( k in value ) {
|
||
|
|
if ( !( skipPrototype && k === 'prototype' ) && hasOwnProp( value, k ) ) {
|
||
|
|
out.push( String( k ) );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if ( HAS_NON_ENUM_PROPS_BUG ) {
|
||
|
|
skipConstructor = isConstructorPrototype( value );
|
||
|
|
for ( i = 0; i < NON_ENUMERABLE.length; i++ ) {
|
||
|
|
p = NON_ENUMERABLE[ i ];
|
||
|
|
if ( !( skipConstructor && p === 'constructor' ) && hasOwnProp( value, p ) ) {
|
||
|
|
out.push( String( p ) );
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return out;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = keys;
|