NAME
prototype.rb
URIS
http://codeforpeople.com/lib/ruby/
http://rubyforge.org/projects/codeforpeople/
SYNOPSIS
prototype.rb facilitates a prototype based coding style
http://en.wikipedia.org/wiki/Prototype-based_programming
for ruby
WHY
prototype based programming can look very nice 
SAMPLES
<========< samples/a.rb >========>
~ > cat samples/a.rb
require 'prototype'
singleton = Prototype.new{
@a, @b = 40, 2
def answer() @a + @b end
}
p singleton.answer
~ > ruby samples/a.rb
42
<========< samples/b.rb >========>
~ > cat samples/b.rb
require 'prototype'
DB = Prototype.new{
host 'localhost'
port 4242
conn_string [host, port].join(':')
def connect() p [host, port] end
}
p DB
p DB.host
p DB.port
p DB.conn_string
DB.connect
~ > ruby samples/b.rb
#<#<Class:0xb7593c54>:0xb759322c @conn_string="localhost:4242", @port=4242, @host="localhost">
"localhost"
4242
"localhost:4242"
["localhost", 4242]
<========< samples/c.rb >========>
~ > cat samples/c.rb
require 'prototype'
a = Prototype.new{
def method() 42 end
}
b = a.clone
p a.method
p b.method
a.extend{
def method2() '42' end
}
p a.method2
p b.method2
b.extend{
def method3() 42.0 end
}
p b.method3
p a.method3 # throws error!
~ > ruby samples/c.rb
42
"42"
42.0
samples/c.rb:24: undefined method `method3' for #<#<Class:0xb7595790>:0xb7595420> (NoMethodError)
<========< samples/d.rb >========>
~ > cat samples/d.rb
require 'prototype'
proto = prototype{ attributes 'a' => 1, 'b' => 2, 'c' => 3 }
proto = prototype{ a 1; b 2; c 3 }
%w( a b c ).each{|attr| p proto.send(attr)}
clone = proto.clone
proto.c = 42
%w( a b c ).each{|attr| p proto.send(attr)}
%w( a b c ).each{|attr| p clone.send(attr)}
~ > ruby samples/d.rb
1
2
3
1
2
42
1
2
3
<========< samples/e.rb >========>
~ > cat samples/e.rb
require 'prototype'
proto = prototype{
@a = 40
@b = 2
}
p(proto.a + proto.b)
~ > ruby samples/e.rb
42
<========< samples/f.rb >========>
~ > cat samples/f.rb
require 'prototype'
a = prototype{ attributes 'a' => 4, 'b' => 10, 'c' => 2}
b = prototype{ a 4; b 10; c 2 }
c = prototype{ @a = 4; @b = 10; @c = 2 }
[a, b, c].each{|obj| p(obj.a * obj.b + obj.c) }
~ > ruby samples/f.rb
42
<========< samples/g.rb >========>
~ > cat samples/g.rb
require 'prototype'
a = prototype
b = prototype(a){ @a, @b, @c = 4, 10, 2 }
a.extend{ def answer() a * b + c end }
p b.answer
~ > ruby samples/g.rb
42
<========< samples/h.rb >========>
~ > cat samples/h.rb
require 'prototype'
proto = prototype{
a 1
b 1
c 40
sum { a + b + c }
}
p proto.sum
~ > ruby samples/h.rb
42
<========< samples/i.rb >========>
~ > cat samples/i.rb
require 'prototype'
o = Object.new
o.prototyping do
@a = 42
attr 'a'
end
p o.a
o = prototype do
@a = 42
attr 'a'
end
p o.a
o.prototyping do
@b = 42
attr 'b'
end
p o.b
o.prototyping do
@b = 42.0
end
p o.b
~ > ruby samples/i.rb
42
42.0
-a
···
--
what science finds to be nonexistent, we must accept as nonexistent; but what
science merely does not find is a completely different matter... it is quite
clear that there are many, many mysterious things.
- h.h. the 14th dalai lama