@stdlib/utils-nonindex-keys
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    0.0.6 • Public • Published

    Non-Index Keys

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    Return an array of an object's own enumerable property names which are not integer indices.

    Installation

    npm install @stdlib/utils-nonindex-keys

    Usage

    var nonIndexKeys = require( '@stdlib/utils-nonindex-keys' );

    nonIndexKeys( obj )

    Returns an array of an object's own enumerable property names which are not integer indices.

    var arr = [ 1, 2, 3 ];
    arr.a = 'foo';
    arr.b = 'bar';
    
    var keys = nonIndexKeys( arr );
    // e.g., returns [ 'a', 'b' ]

    Notes

    • Name order is not guaranteed, as object key enumeration is not specified according to the ECMAScript specification. In practice, however, most engines use insertion order to sort an object's keys, thus allowing for deterministic extraction.
    • In contrast to the built-in Object.keys(), if provided null or undefined, the function returns an empty array, rather than throwing an error.

    Examples

    var nonIndexKeys = require( '@stdlib/utils-nonindex-keys' );
    
    function Foo() {
        this[ 0 ] = 3.14;
        this.beep = 'boop';
        this.a = {
            'b': 'c'
        };
        return this;
    }
    
    Foo.prototype.foo = [ 'bar' ];
    
    var obj = new Foo();
    var keys = nonIndexKeys( obj );
    
    console.log( keys );
    // e.g., => [ 'beep', 'a' ]

    Notice

    This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

    For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.

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    License

    See LICENSE.

    Copyright

    Copyright © 2016-2021. The Stdlib Authors.

    Install

    npm i @stdlib/utils-nonindex-keys

    Homepage

    stdlib.io

    DownloadsWeekly Downloads

    31

    Version

    0.0.6

    License

    Apache-2.0

    Unpacked Size

    36.4 kB

    Total Files

    9

    Last publish

    Collaborators

    • stdlib-bot
    • kgryte
    • planeshifter
    • rreusser