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Lambda expressions are called/applied when they are the first value in a nonspecial form. They are typically called by name from the environment, or occasionally the value of a lambda expression is invoked immediately.

The first model we ll build is the blog model. This will be the core model of our blog and will be used to name the blog and potentially to store configuration settings specific to our blog. At this point in the project, our blog model doesn t need to hold a lot, just a name for our blog. Open a command prompt in the root of your application, and create our blog model with the following command: ruby script/generate model Blog name:string

(define addone (lambda (x) (+ x 1))) (addone 3) 4.0 ((lambda () 1)) 1.0 ((lambda (x) (+ x 1)) 3) 4.0 lambda is the most interesting of the special forms you ll be implementing. It s going to need to remember the names of its parameters and also the code that forms its body. But because lambdas are closures, they ll also need to capture the environment they were created in. (define x 1) (define increment (lambda () (set! x (+ x 1)))) x 1 (increment) x 2

Figure 9-37. The MythVideo gallery interface inside a subfolder The item in the top left will return you to the parent folder. To play a video, simply select it in the interface, and press the OK button on your remote or the Enter key on your keyboard. This will launch the player specified for this file type (or the specific player for this video if you have overridden the default). Other user interfaces are available as well, as mentioned earlier in this section. If you press the Menu button on your remote or the M key on the keyboard, then you will see the options shown in Figure 9-38.

So what will the Lambda class look like in Ruby Well, it will have a captured environment and a reference to the special forms mapping so that code inside the closure can be evaluated using lispeval. It will also have a list of parameter names and the expressions that will be evaluated when it is called.

app/models/ test/unit/ test/fixtures/ app/models/blog.rb test/unit/blog_test.rb test/fixtures/blogs.yml db/migrate db/migrate/001_create_blogs.rb

class Lambda def initialize(env, forms, params, *code) @env = env @forms = forms @params = params.arrayify @code = code end end

Another option is the browse view, which is great if you have a relatively small number of videos or want to see a lot of detail about a video (see Figure 9-39).

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