ruby - 要使用多个键散列的数组

Question

我如何打开它:

[[3, 18], [5, 20], [7, 22]]

进入这个:

[
  {:quantity=>3, :price=>18},
  {:quantity=>5, :price=>20},
  {:quantity=>7, :price=>22}
]

希望得到一个简单的答案，但我会尽力而为。

Answer 1

使用 Array#map :

a = [[3, 18], [5, 20], [7, 22]]
a.map { |item| {quantity: item[0], price: item[1]} }
# => [{:quantity=>3, :price=>18},
#     {:quantity=>5, :price=>20},
#     {:quantity=>7, :price=>22}]

a.map { |q, p| {quantity: q, price: p} }
# => [{:quantity=>3, :price=>18},
#     {:quantity=>5, :price=>20},
#     {:quantity=>7, :price=>22}]

a.map { |item| Hash[[:quantity, :price].zip(item)] }
# => [{:quantity=>3, :price=>18},
#     {:quantity=>5, :price=>20},
#     {:quantity=>7, :price=>22}]