哈希散列数组 [英] Array of hashes to hash

问题描述

例如，我有一些单哈希值

  a = [{a：：b}，{c：： d}] 
  

将其转换为此值的最佳方法是什么？

  {a：：b，c：：d} 
  

<您可以使用

  a.reduce Hash.new， ：合并
  

直接产生

  {：a =>：b，：c =>：d} 
  

请注意，如果发生碰撞，顺序很重要。后者哈希会覆盖以前的映射，参见例如：

  [{a：：b}，{c：：d}，{e ：：f：a：：g}]。reduce Hash.new，：merge＃{：a =>：g，：c =>：d，：e =>：f} 
  




For example, I have array of single hashes

a = [{a: :b}, {c: :d}]

What is best way to convert it into this?

{a: :b, c: :d}

解决方案

You may use

a.reduce Hash.new, :merge

which directly yields

{:a=>:b, :c=>:d}

Note that in case of collisions the order is important. Latter hashes override previous mappings, see e.g.:

[{a: :b}, {c: :d}, {e: :f, a: :g}].reduce Hash.new, :merge   # {:a=>:g, :c=>:d, :e=>:f}

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