practice for Ruby.

openhash.rb

#! /usr/local/bin/ruby

class OpenHash

  def initialize elems,f = ->(ob){ return ob.hash}
    @hashf = f
    @val = { }
    elems.each do |elem|
      insert elem
    end
  end

  def insert elem
    v = @hashf.call elem
    if @val[@hashf.call elem] == nil
      @val[@hashf.call elem] = [elem]
    else
      @val[@hashf.call elem].push elem
    end
  end

  def contain? elem
    v = @hashf.call elem
    return (@val[v] != nil and @val[v].index elem !=nil)
  end

  def remove elem
    v = @hashf.call elem
    if @val[v] !=nil and @val[v].index elem != nil
      @val[v].delete elem
    end
  end

  def showall
    @val.each do |key,list|
      puts "#{key}: #{list}"
    end
  end

  def getall
    retval = []
    @val.each do |key,list|
      list.each do |e|
        retval.push e
      end
    end
    return retval
  end
end

sample = "alskjfak","jfks","dddd","soso",123213,22.55,"dkfdskjkfdla","a","alkdkdkdkdkdkdkdkd"

puts "oh"
oh = OpenHash.new sample
oh.showall

puts "oh2"
oh2 = OpenHash.new [],->(e){ return e.to_s.length}
oh2.insert "aaa"
oh2.insert "ddd"
oh2.insert "aaaa"
oh2.showall