hash and array

hash_and_array.rb

# -*- coding: utf-8 -*-

# ハッシュの中に配列
array_in_hash = {:hoge => [1,2] , :fuga => [3,4]} 

# keyを渡すと配列が返ってくる
p array_in_hash[:hoge]    # => [1, 2]

# その配列の0番目
p array_in_hash[:hoge][0] # => 1


# 配列の中にハッシュ
hash_in_array = [ {:hoge => 10, :fuga => 20} , {:hoge => 15, :fuga => 25}]

# 添字を渡すとハッシュが返ってくる
p hash_in_array[1]        # => {:hoge=>15, :fuga=>25}

# そのハッシュにkeyを渡す
p hash_in_array[1][:fuga] # => 25