Learn Ruby on Rails - Codecademy

Example-4.rb

# .reverse 的用法，倒轉字串
a = "simultaneously"
puts a.reverse

# .upcase & .downcase，轉換大小寫
a = "simultaneously"
puts a.upcase
puts a.downcase

# =begin & =end 搭配，將一個範圍裡的 Code 都不被解讀。
=begin
This is for a test.
=end

# 用#{XXX}印出變數的值
my_name = "Andy"
my_age = 28

puts "My name is #{my_name}"
puts "My age is #{my_age}"

# String methods，可以連續下指令
name = "Andy".downcase.reverse.upcase
puts name

# .include?，確認是否有某字串，並用.gsub! 給予取代 (/xxx/,"yyy")
if user_input.include? "s"
  user_input.gsub!(/s/,"th")
end