How to Get an Array of Object Keys in JavaScript?

Obtaining an Array of Object Keys in JavaScript

Retrieving the keys of a JavaScript object as an array can often be a task that requires verbose code. To address this, there are commonly used methods in both jQuery and pure JavaScript that simplify this process.

jQuery

In jQuery, the $.map() function can be utilized to extract the keys from an object:

var foo = { 'alpha' : 'puffin', 'beta' : 'beagle' };
var keys = $.map(foo, function(value, key) {
    return key;
});

This approach maps through the object, extracting the keys and creating an array containing them.

Pure JavaScript

Object.keys is a native JavaScript method that provides a straightforward way to obtain an array of object keys:

var foo = { 'alpha' : 'puffin', 'beta' : 'beagle' };
var keys = Object.keys(foo);

This method effectively creates an array containing the keys of the object, with the order of the keys potentially differing depending on the implementation.

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