如何根据数组值从哈希数组中提取哈希

Question

input_hash = [{"id"=>"123", "name"=>"ashly"}, {"id"=>"73", "name"=>"george"}, {"id"=>"175", "name"=>"nancy"}, {"id"=>"433", "name"=>"grace"}]
check = ["73", "175"]

output => "george, nancy"

我可以猜到可以使用"选择"。但不太确定它如何在数组中选择两个值

Answer 1

input_hash.map(&:values).to_h.values_at(*check).join(", ")
# => "george, nancy"

Answer 2

check.flat_map{|c| input_hash.select{|aa| aa["id"] == c}}.map{|a| a["name"]}.join(", ")
=> "george, nancy"

或

input_hash.select{|h| h["name"] if check.include? h["id"]}.map{|aa| aa["name"]}.join(", ")
=> "george, nancy"

Answer 3

input_hash.map { |hash| hash["name"] if check.include?(hash["id"]) }.compact

Answer 4

input_hash.select {|h| check.include?(h["id"])}.map {|h| h["name"]}.join(", ")

Answer 5

试试这个：

def get_output_hash(input_hash, ids)
  input_hash.each do |hash|
    if ids.include?(hash["id"])
      p hash["name"]
    end
  end
end

这样称呼它：-

input_hash = [{"id"=>"123", "name"=>"ashly"}, {"id"=>"73", "name"=>"george"}, {"id"=>"175", "name"=>"nancy"}, {"id"=>"433", "name"=>"grace"}]
get_output_hash(input_hash, ["73", "175"])