Ruby之旅(十) Ruby中的字符串

Ruby中的字符串处理非常灵活

"abc"[0]  返回97 就是a
"abc"[1] 98
"abc"[2] 99
"abc"[3] nil
"abc"[-1] 99 从后向前数
"abc"[-2] 98
"abc"[-3] 97
"abc"[-4] nil


"abc" * 2 返回"abcabc" 支持乘法运算

"abc" + "def"  返回"abcdef"

"abcdef"[0,1]  "a"  从位置0开始抽取1位
"abcdef"[1,3] "bcd"
"abcdef"[-3,3] "def"
"abcdef"[1..3] "bc"  从1到3

来一个猜谜语的程序

words = ["hallo","world","lee"]
puts "guess word by \"#{words.join(",")}\""
scret = words[rand(3)]
while guess = gets
  guess.chop!
  if guess == scret
    puts "you win"
    break
  else
    puts "you loss,guess?"
  end
end
puts "the words is #{scret}"