Berkeley SaaS class HW1 fun with strings

gistfile1.rb

#!/usr/bin/ruby

def palindrome?(string)
  string.downcase!
  string=string.gsub(/[^a-z]+/,'')  # 正则表达式替换
  string==string.reverse
end

p palindrome?('thissiht')

def count_words(string)
  string.downcase!
  scan=string.scan(/[a-z]+/)  # 搜索所有匹配正则表达式的子串
  count={}
  scan.each do |x| 
    if count.has_key?x then # has_key?
      count[x]=count[x]+1
    else 
      count[x]=1
    end
  end
  count
end

p count_words('aslkdflas sadf sadsf sadf sadf e c e c ')