82 lines
1.6 KiB
JavaScript
82 lines
1.6 KiB
JavaScript
|
/**
|
||
|
|
* @license Apache-2.0
|
||
|
|
*
|
||
|
|
* Copyright (c) 2019 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 objectKeys = require( './../../keys' );
|
||
|
|
|
||
|
|
|
||
|
|
// VARIABLES //
|
||
|
|
|
||
|
|
var RE_INTEGER_INDEX = /^[0-9]+$/;
|
||
|
|
|
||
|
|
|
||
|
|
// MAIN //
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Returns an array of an object's own enumerable property names which are not integer indices.
|
||
|
|
*
|
||
|
|
* @param {ObjectLike} obj - input object
|
||
|
|
* @returns {Array} key array
|
||
|
|
*
|
||
|
|
* @example
|
||
|
|
* function Foo() {
|
||
|
|
* this[ 0 ] = 3.14;
|
||
|
|
* this.beep = 'boop';
|
||
|
|
* return this;
|
||
|
|
* }
|
||
|
|
*
|
||
|
|
* Foo.prototype.foo = 'bar';
|
||
|
|
*
|
||
|
|
* var obj = new Foo();
|
||
|
|
*
|
||
|
|
* var keys = nonIndexKeys( obj );
|
||
|
|
* // e.g., returns [ 'beep' ]
|
||
|
|
*/
|
||
|
|
function nonIndexKeys( obj ) {
|
||
|
|
var keys;
|
||
|
|
var len;
|
||
|
|
var N;
|
||
|
|
var i;
|
||
|
|
var j;
|
||
|
|
|
||
|
|
keys = objectKeys( obj );
|
||
|
|
len = keys.length;
|
||
|
|
N = len;
|
||
|
|
j = 0;
|
||
|
|
|
||
|
|
// Compress the list of keys by using a lagging index and moving non-integer indices to earlier positions in the array...
|
||
|
|
for ( i = 0; i < len; i++ ) {
|
||
|
|
if ( RE_INTEGER_INDEX.test( keys[ i ] ) ) {
|
||
|
|
N -= 1;
|
||
|
|
} else {
|
||
|
|
keys[ j ] = keys[ i ];
|
||
|
|
j += 1;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
keys.length = N;
|
||
|
|
return keys;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
// EXPORTS //
|
||
|
|
|
||
|
|
module.exports = nonIndexKeys;
|