如何從 ruby 中的數組/哈希中獲取所有可能的字符串組合？

Question

我是初級后端嘗試 ruby。我有這些數據：

people = ["Andy", "Budi", "Charles"]
vehicles = ["Bicycle", "Car", "Bajaj"]
destinations = ["USA", "Bali", "Paradise"]


string_format = %{person} ride %{vehicle} to %{destination}

如何使用 ruby 獲取字符串的所有可能組合？ 預計 output 共 27 項（3 x 3 x 3）：

1. Andy ride Bicycle to USA
2. Andy ride Bicycle to Bali
3. Andy ride Bicycle to Paradise
4. Andy ride Car to USA

...

27. Charles ride Bajaj to Paradise

代碼應該是可擴展的，因為稍后我們將添加更多數組，例如：

adjectives = ["happily", "sadly"]

string_format = %{destination} has been visited by %{person} using %{his_or_her} %{vehicle} %{adjectives}

Answer 1

您可以使用Array#product返回包含所有組合的數組：

people.product(vehicles, destinations)
# => [["Andy", "Bicycle", "USA"], ["Andy", "Bicycle", "Bali"], ["Andy", "Bicycle", "Paradise"], ["Andy", "Car", "USA"], ["Andy", "Car", "Bali"], ["Andy", "Car", "Paradise"], ["Andy", "Bajaj", "USA"], ["Andy", "Bajaj", "Bali"], ["Andy", "Bajaj", "Paradise"], ["Budi", "Bicycle", "USA"], ["Budi", "Bicycle", "Bali"], ["Budi", "Bicycle", "Paradise"], ["Budi", "Car", "USA"], ["Budi", "Car", "Bali"], ["Budi", "Car", "Paradise"],["Budi", "Bajaj", "USA"],["Budi", "Bajaj", "Bali"],["Budi", "Bajaj", "Paradise"],["Charles", "Bicycle", "USA"],["Charles", "Bicycle", "Bali"],["Charles", "Bicycle", "Paradise"],["Charles", "Car", "USA"],["Charles", "Car", "Bali"],["Charles", "Car", "Paradise"],["Charles", "Bajaj", "USA"],["Charles", "Bajaj", "Bali"],["Charles", "Bajaj", "Paradise"]]

這可以像這樣用於 output 你的列表：

people.product(vehicles, destinations).each do |person, vehicle, destination|
  puts "#{person} ride #{vehicle} to #{destination}"
end