Liquid Development

I have found the Ruby Extension project.

Let's see what I can get from a first quick pass..

Excerpt VII

  str = "Hello, \n\n  world!"
  str.define_method(:heading) {
    ('*** ' + self.join + ' ***').indent(3)
  }
  str.heading         # -> "   *** Hello, world! ***"

very nice for metaprogramming.  metaprogramming in ruby can quickly get quite messy if you are not careful to continuously refactor your intent.

Excerpt VIII

  person = OpenStruct.new do |p|
    p.name = 'John'
    p.age  = 90
  end

Ah, I have written stuff like this in the past! This is very much in the spirit of the nooclay.  Maybe I should publish my Clay code one of these days.

Excerpt IX

  class Person
    attr_reader :name, :age, :pension
    autoinit :name, :age do |p|
      @pension = 30000 + (@age - 65) * 350
    end
  end

autoinit is v. useful. that's another bit of nooclay behaviour.

Excerpt X

  HELP = %{
    | Usage: ...
    | Lorem ipsum...
  }.trim('|')

Ah, this is similar to Brian Marick's code trick.  I like it.  Text should become a first class citizen of code.

Excerpt XI

STR = "Hello, world!"
  STR.starts_with? "Hello"       # -> true
  STR.ends_with? "world"         # -> false
  File.write("hello.txt", STR)

Of course. of course!

Excerpt XII

arr = [1, 3, 5]
  arr.rand                       # -> 1, 3, or 5
  arr.none? { |n| n.even? }      # -> true
  arr.one?  { |n| n > 4 }        # -> true

I wrote it myself in the past. very useful and practical.

Excerpt XIII

Class.by_name "Process::Sys"   # -> Process::Sys
  Process::Sys.basename          # -> "Sys"

again, very useful metaprogramming.

Excerpt XIV

   Binding.of_caller

This allows you to access the context of the caller of a function.
How do they do it?  I have to find out.
Very useful and very dangerous.
I can see lots of interesting work been done here by exploiting the context of a call.