WEBDOOD.COM

Javascript Array Detection

by webdood on Oct.06, 2010, under Javascript, Software Development

Turns out the most reliable way to detect an Array is not to use the old standby:

return (typeof foo === ‘object’ && foo.constructor === Array)

but rather to do this:

function isArray(anArray) {
  return Object.prototype.toString.apply(anArray) === "[object Array]";
}

I have to give credit to my friend Doug Crockford, for this.

I recommend his book Javascript: The Good Parts

shannon norrell

:, ,

Leave a Reply

Looking for something?

Use the form below to search the site:

Still not finding what you're looking for? Drop a comment on a post or contact us so we can take care of it!

Blogroll

A few highly recommended websites...

  • A List Apart
  • Dive into HTML5
  • Javascript: The Good Parts
  • QuirksMode.org