メタプログラミング Ruby の輪読会 4 章までの復習と 5.1〜5.3 章の紹介。

1. RUBY
§ 1-4 , § 5.1-5.3
Jumpei Yokota
@IPROS Corp.
1

2. § 1-4
2

3. ➤
➤ obj.class # => Greetin
➤
➤ obj.class.instance_methods(false) # => [:welcome]
➤
➤ obj.instance_variables # => [:@text]
3

4. ➤ include
➤
➤
➤ Ruby
4

5. ➤ Refinements
➤ module StringExtentions; refine String do; def …
➤
➤ Object#send
obj.send(my_method, 3)
➤ Module#define_method
➤ method_missing
➤ class String; def method_missing(method, *args)…
5

6. ➤
➤ my_method {|x| “x + y”}
➤ Kernel#block_given?
➤
➤
6

7. instance_eval
➤
➤ BasicObject#instance_eval
➤
→
7

8. ➤ Proc
➤
➤ &
➤ lambda
➤ return lambda Proc Proc
➤
➤
➤ Object#method
➤ Object#call
➤ Method#to_proc ⇔ Module#define_method
8

9. § 5
9

10. ➤ Ruby
→ self
➤ self
➤ self
self
main
Object 10

11. obj D
→ D
C
11

12. CLASS_EVAL
➤
Module#class_eval
12

13. self obj
obj 2
MyClass
13

14. CLASS_EVAL
➤
➤ Loan to_s
def to_s
# initialize @time = Time.now
“#{@book.upcase} loaned on #{@time}”
end
➤
➤ @time = Loan.time_class.now
➤ def self.time_class
@time_class || Time # @time_class = nil →
end
➤ @time_class FakeTime
Loan.instance_eval { @time_class = FakeTime }
14

15. ➤
➤ String
str title?
➤ Object#define_singleton_method
15

16. ➤
self.hoge
16

17. ➤ Ruby
➤
➤ Module#attr_
➤ Module#attr_reader
➤ Module#attr_writer
➤ Module#attr_accessor
17