Extract Object Values using ECMAScript 5 methods

I find the Object.keys method on ECMAScript 5 extremely useful to return an array containing enumerable properties on a given object. I had a JavaScript object and wanted to extract the values of the object in the shortest possible way. Since my app was targeting the latest browsers, I decided to use Object.keys and the Array.map() method to achieve the task

Here’s how it was done. First, the object is declared as shown here:

EcmaScript Object.Keys

In order to extract values from the object, we are using the following code:

var values = ExtractValues(jObj);

function ExtractValues(o) {
    return Object.keys(o).map(function (objKey) {
        return o[objKey];

As you can see, we are using Object.keys to return an array with properties and then use map which provides a callback function once for each element in an array, and constructs a new array from the results.

Here’s the output


Note: As of this writing, this code will work in IE9, Firefox 4, Safari 5 and Chrome 6-11.

About The Author

Suprotim Agarwal
Suprotim Agarwal, Developer Technologies MVP (Microsoft Most Valuable Professional) is the founder and contributor for DevCurry, DotNetCurry and SQLServerCurry. He is the Chief Editor of a Developer Magazine called DNC Magazine. He has also authored two Books - 51 Recipes using jQuery with ASP.NET Controls. and The Absolutely Awesome jQuery CookBook.

Follow him on twitter @suprotimagarwal.

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