::
を使ったメソッド呼び出し¶Time.now
2015-03-25 19:35:25 +0900
Time::now
2015-03-25 19:35:30 +0900
この記法はrubocopに怒られる
def greet
puts 'hola'
end
greet
hola
undef greet
greet
NameError: undefined local variable or method `greet' for main:Object (pry):9:in `<main>' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `evaluate_ruby' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:323:in `handle_line' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `block in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/backend.rb:28:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:110:in `execute_request' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:62:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:30:in `run_kernel' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:16:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/bin/iruby:6:in `<top (required)>' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `load' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `<main>'
undefの使い道は更新系を防ぐとかに使える ref: http://rochefort.hatenablog.com/entry/2013/05/21/214457
alias greet puts
greet 'hi'
hi
greet 'No thank you'
No thank you
undef puts
puts 'hoge'
NoMethodError: undefined method `puts' for main:Object (pry):14:in `<main>' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `evaluate_ruby' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:323:in `handle_line' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `block in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/backend.rb:28:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:110:in `execute_request' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:62:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:30:in `run_kernel' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:16:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/bin/iruby:6:in `<top (required)>' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `load' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `<main>'
greet 'fuga'
fuga
alias puts greet
puts 'foo'
foo
def foo
raise
end
:foo
foo
RuntimeError: (pry):19:in `foo' (pry):21:in `<main>' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `evaluate_ruby' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:323:in `handle_line' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `block in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/backend.rb:28:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:110:in `execute_request' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:62:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:30:in `run_kernel' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:16:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/bin/iruby:6:in `<top (required)>' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `load' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `<main>'
alias bar foo
bar
RuntimeError: (pry):19:in `foo' (pry):24:in `<main>' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `evaluate_ruby' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:323:in `handle_line' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `block in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/backend.rb:28:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:110:in `execute_request' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:62:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:30:in `run_kernel' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:16:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/bin/iruby:6:in `<top (required)>' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `load' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `<main>'
undef foo
bar
RuntimeError: (pry):19:in `foo' (pry):26:in `<main>' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `evaluate_ruby' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:323:in `handle_line' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `block in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/backend.rb:28:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:110:in `execute_request' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:62:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:30:in `run_kernel' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:16:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/bin/iruby:6:in `<top (required)>' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `load' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `<main>'
puts 1
puts "hoge\n"
puts "Python", "Ruby"
1 hoge
ArgumentError: wrong number of arguments (2 for 1) /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/ostream.rb:36:in `puts' (pry):29:in `puts' (pry):29:in `<main>' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `evaluate_ruby' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:323:in `handle_line' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `block in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/backend.rb:28:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:110:in `execute_request' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:62:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:30:in `run_kernel' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:16:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/bin/iruby:6:in `<top (required)>' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `load' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `<main>'
IRubyのバグ
本来は
puts "A", "B"
A
B
=> nil
print "Hi"
print 1, 2, 'hoge'
Hi12hoge
sprintf '%04d', 1
"0001"
format '%04d', 1
"0001"
'%04d !!!!! %s' % [1, 'yeyyey']
"0001 !!!!! yeyyey"
'あなたは%04d人目の来訪者です' % [10]
"あなたは0010人目の来訪者です"
num = 10
"ほげ#{num}人目"
"ほげ10人目"
'あなたは%<num>04d人目の来訪者です' % {num: 10}
"あなたは0010人目の来訪者です"
/(?<num>\d+)人目/ =~ '10人目'
0
p num
"10"
"10"
/(?<num2>\d+)人目/.match '10人目'
#<MatchData "10人目" num2:"10">
num2
NameError: undefined local variable or method `num2' for main:Object (pry):59:in `<main>' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `evaluate_ruby' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:323:in `handle_line' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `block in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/backend.rb:28:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:110:in `execute_request' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:62:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:30:in `run_kernel' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:16:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/bin/iruby:6:in `<top (required)>' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `load' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `<main>'
'10人目' =~ /(?<num3>\d+)人目/
0
num3
NameError: undefined local variable or method `num3' for main:Object (pry):61:in `<main>' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:355:in `evaluate_ruby' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:323:in `handle_line' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:243:in `block (2 levels) in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:242:in `block in eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `catch' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/pry-0.10.1/lib/pry/pry_instance.rb:241:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/backend.rb:28:in `eval' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:110:in `execute_request' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/kernel.rb:62:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:30:in `run_kernel' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/lib/iruby/command.rb:16:in `run' /Users/mic/.rbenv/versions/2.1.0/lib/ruby/gems/2.1.0/gems/iruby-0.1.13/bin/iruby:6:in `<top (required)>' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `load' /Users/mic/.rbenv/versions/2.1.0/bin/iruby:23:in `<main>'
m = /(?<num2>\d+)人目/.match '10人目'
m[:num2]
"10"
次回は P.109の Ruler
classより