Getting Started 7
18 console.log("underscore identity call: ", un.identity(5));
19 });
First, we indicate where Underscore is located (line 5). With that done, we add the “underscore”
key to the shim object and indicate that it should return the value of the “_” global to the callback
function. Notice that, thanks to the shim, we have access to both the global “_” value (line 17) and
the un callback value (line 18). If we hadn’t used a shim, we wouldn’t be able to use the un callback
value, only the “_” global.
How come we require 2 files, but have only one callback argument? Because we only
explicitly state the callback arguments we’re going to be using (and for which we need
a variable to reference). So why bother having the “jquery” as a dependency? Because
even though we’re not using an explicit callback argument value, we know that within the
callback function jQuery has been loaded and can be used via the global $ variable. This is
due to jQuery’s particularity of registering a global variable we can reference: there’s no
need to use a callback argument.
Let’s move on to loading something with dependencies: Backbone. Here we go:
assets/js/require_main.js
1 requirejs.config({
2 baseUrl: "assets/js",
3 paths: {
4 backbone: "vendor/backbone",
5 jquery: "vendor/jquery",
6 json2: "vendor/json2",
7 underscore: "vendor/underscore"
8 },
9
10 shim: {
11 underscore: {
12 exports: "_"
13 },
14 backbone: {
15 deps: ["jquery", "underscore", "json2"],
16 exports: "Backbone"
17 }
18 }
19 });
20
21 require(["backbone"], function(bb){
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