完成了 Learn Ruby The Hard Way ，但是在 Codecademy 上面的课程还是没有完成。今天抽空从头复习了一下，发现了不少在 lrthw 中没有提到的地方。
字符串方法
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| .length
.reverse
.upcase
.downcase
.capitalize
.gsub!(/s/,"th") # replace s with th, while gsub is short for **g**lobal **sub**stitution.
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多行注释
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| =begin
注释
Multi-Line Comments
=end
# Single-Line Comments
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控制流
if/else
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| if true
# do something
elsif
# do something else
else
# others
end
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unless/else
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| unless false
# do something
elsif
# do something else
else
# others
end
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循环
while
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| while true
# do something
end
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until
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| until false
# do something
end
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loop
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| loop do
next if true # equals continus
# do something
break if true
end
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.each
Multi-Line
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| array = [1, 2, 3]
array.each do |x|
# do something
end
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Single-Line
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| object.each { |item| # Do something }
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.times
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| 3.times{print "Delbert"} # print "Delbert" out for 3 times{print
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