Ruby在哈希中组合元素 [英] Ruby combine elements in hash

问题描述

我有一个看起来像这样的食物:

I have a has that looks like this:

data = {abc -> [[date1, val1], [date2,val2]], def -> [[date1,val3], [date2,val4]]}

我想加入abc和def元素，就像这样:

I want to join the abc and def elements so it's like this:

data = {join -> [[date1, val1+val3], [date2, val2+val4]] }

我该如何处理.请注意，哈希中还有其他不应修改的元素.

How do I go about this. Note that there are other elements in the hash that should not be modified.

推荐答案

我假设abc，def和join实际上是符号.

I am assuming that abc, def, and join are actually Symbols.

a = Hash[data.delete(:abc)]  # extract data[:abc] and convert it to a Hash ("a")
b = Hash[data.delete(:def)]  # extract data[:def] and convert it to a Hash ("b")
data[:join] = a.map do |k,v| # iterate over one of the extracted Hashes
  [k, v + (b[k] || 0)]       # for each key, return a 2-item array with the key,
end                          #   and the sum of the values from "a" and "b"

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