Question

Kanso.js is a tool to easily let you build couchapps. As can be read in the documentation it includes the underscore.js module.

But how can I exactly make use of the underscore.js methods in, let’s say, a list view? Do I have to require it first? For example I have been playing around a but with the union method:

var newArray = oldArray1.union(oldArray2)

or

var newArray = union(oldArray1, oldArray2)

However, Kanso keeps on raising a typeError when requesting the list over HTTP.

Answer 1

First require the underscore module at the top of your file. If you’re on the dev branch of Kanso (version 0.0.8), It looks like this:

_ = require('underscore')._;

In Kanso 0.0.7 it will look like this:

_ = require('kanso/underscore')._;

Then call union from the underscore object

var newArray = _.union(oldArray1, oldArray2);

Edit:

In Kanso 0.2.1 (the current version at the time of writing), underscore has it’s own package. Here’s how to use it:

1. Add underscore as a dependency in your kanso.json file.

   "dependencies": {
       ...
       "underscore": null
   }
   

2. Run kanso install in your project directory.

3. Require underscore in a module.

   _ = require('underscore')._;