從Ruby數組中創建一個映射

Question

我想在Ruby中編寫一個函數，它可以接受一個數組中的數組，並將其轉換爲哈希。這將用於模擬句子並創建任意的單詞序列。生成的地圖將有助於生成與當前句子規則一起提供的所有句子組合。

我該如何去做到這一點？我有點失落，從哪裏開始。

Answer 1

嘗試這種情況：

arr = [ ["<start>", "The <object> <verb> tonight."], 
     ["<object>", "waves", "big yellow  flowers", "slugs"], 
     ["<verb>", "sigh <adverb>", "portend like <object>", "die <adverb>"], 
     ["<adverb>", "warily", "grumpily"] ] 

arr.map { |ar| [ar.shift, ar.map { |str| str.split }] }.to_h 
#=> 
#{ "<start>" => [["The", "<object>", "<verb>", "tonight."]], 
# "<object>" => [["waves"], ["big", "yellow", "flowers"], ["slugs"]], 
# "<verb>" => [["sigh", "<adverb>"], ["portend", "like", "<object>"], ["die", "<adverb>"]], 
# "<adverb>" => [["warily"], ["grumpily"]] } 

ar.shift需要每個子陣列的第一個元素。與ar.map一起使用的塊將剩餘的元素拆分爲數組（空白）。最後，to_h將結果數組轉換爲散列。