ruby基于另一个数组从数组中删除项目

debugcn 发表于 Dev

用户名

我有两个数据，

{:date=>"2015-09-23", :time=>["13:30"]}
{:date=>"2015-09-23", :time=>["12:00"]}
...more

我试图从中删除

{:date=>"2015-09-21", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]}
{:date=>"2015-09-22", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]}
{:date=>"2015-09-23", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]}
{:date=>"2015-09-24", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]}

我希望可以得到的输出

{:date=>"2015-09-21", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]}
{:date=>"2015-09-22", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]}
{:date=>"2015-09-23", :time=>["12:30", "13:00", "14:00", "14:30"]}
{:date=>"2015-09-24", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]}

我试过了

removeAry.each do |b|
  if b[:date] == "2015-09-23"
    puts b[:time].to_s.delete("13:30")
  end
end

有更好的主意吗？

阿列克谢·谢恩（Alexey Shein）

好的，这就是我要做的：

require 'set'

to_delete = [
  {:date=>"2015-09-23", :time=>["13:30"]},
  {:date=>"2015-09-23", :time=>["12:00"]}
]

data = [
  {:date=>"2015-09-21", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]},
  {:date=>"2015-09-22", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]},
  {:date=>"2015-09-23", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]},
  {:date=>"2015-09-24", :time=>["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]}
]

# convert to_delete array to a hash { "2015-09-23" => #<Set: {"13:30", "12:00"}> }
# we use Set here to store only unique time values
to_delete_as_hash = to_delete.reduce({}) do |acc, item|
  acc[item[:date]] ||= Set.new
  acc[item[:date]] += item[:time]
  acc
end

filtered = data.map do |item|
  # skip this item if there's no need to process this date
  next item unless to_delete_as_hash[item[:date]]
  # subtract to_delete values from current item[:time] values
  item[:time] -= to_delete_as_hash[item[:date]].to_a
  item
end

p filtered

输出：

[
    {:date => "2015-09-21", :time => ["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]},
    {:date => "2015-09-22", :time => ["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]},
    {:date => "2015-09-23", :time => ["12:30", "13:00", "14:00", "14:30"]},
    {:date => "2015-09-24", :time => ["12:00", "12:30", "13:00", "13:30", "14:00", "14:30"]}
]

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