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