Over a million developers have joined DZone.
{{announcement.body}}
{{announcement.title}}

Underscore.js and guid function

DZone's Guide to

Underscore.js and guid function

· Web Dev Zone ·
Free Resource

Deploying code to production can be filled with uncertainty. Reduce the risks, and deploy earlier and more often. Download this free guide to learn more. Brought to you in partnership with Rollbar.

Underscore library comes with the uniqueId() function that generates globally unique IDs to use in code. But it was not enough for my Backbone models as I needed the IDs to be unique across  invocations and users, i.e. something like UUID.

I have been using this code snippet to generate pseudo unique IDs for some time. Since it’s a utility function and it made lots of sense to move it to Underscore itself. Here’s how I did it.

_.mixin({
    guid : function(){
      return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        var r = Math.random()*16|0, v = c == 'x' ? r : (r&0x3|0x8);
        return v.toString(16);
      });
    }
  });

Once the above code is in place, then creating a unique ID is as simple as calling _.guid().



Deploying code to production can be filled with uncertainty. Reduce the risks, and deploy earlier and more often. Download this free guide to learn more. Brought to you in partnership with Rollbar.

Topics:

Published at DZone with permission of

Opinions expressed by DZone contributors are their own.

{{ parent.title || parent.header.title}}

{{ parent.tldr }}

{{ parent.urlSource.name }}