如何從散列中獲取值到多維數組中？

Question

我得到一個多維數組和一幫這裏面鍵值散列，就像是：

[{"key1"=>"value", "key2"=>[value, value]}, {"key1"=>"value", "key2"=>[value, value]}, {"key1"=>"value", "key2"=>[value, value]}, {"key1"=>"value", "key2"=>[value, value]}] 

我需要什麼，是讓所有從這個數組key1值和真不敢不知道如何去執行它。任何建議都會有所幫助，謝謝。

Answer 1

arr = [{"key1"=>"value", "key2"=>[value, value]}, 
    {"key1"=>"value", "key2"=>[value, value]}, 
    {"key1"=>"value", "key2"=>[value, value]}, 
    {"key1"=>"value", "key2"=>[value, value]}] 

    key1s = arr.map{|h|h["key1"]}