数组元素

Question

我得到这个阵列的难匹配：

@array = [["1003", "4"], ["963", "3"], ["1006", "1"], ["1064", "1"], ["1095", "1"], ["963", "http://www.google.com/1"], ["1003", "http://www.google.com/2"]] 

，我需要这个作为结果：

@array = [["1003", "http://www.google.com/2"], ["963", "http://www.google.com/1"]] 

1. 匹配每[0]彼此，如果它符合一套“ http：link“链接到[1]。
2. 删除所有没有匹配的entrys。

这怎么可能？

Answer 1

Hash[@array].reject{|k,v| v == "1"}.to_a 

这是什么做的：

初始化数组：

@array => [["1003", "4"], ["963", "3"], ["1006", "1"], ["1064", "1"], ["1095", "1"], ["963", "http://www.google.com/1"], ["1003", "http://www.google.com/2"]] 

转换为哈希：

hash = Hash[@array] => {"1003"=>"http://www.google.com/2", "963"=>"http://www.google.com/1", "1006"=>"1", "1064"=>"1", "1095"=>"1"} 

删除其中的值是== “1”：

hash = hash.reject!{|k,v| v == "1"} => {"1003"=>"http://www.google.com/2", "963"=>"http://www.google.com/1"} 

转换回阵列：

hash.to_a => [["1003", "http://www.google.com/2"], ["963", "http://www.google.com/1"]] 

拒绝是delete_if

Answer 2

神奇的别名！

@array = [["1003", "4"], ["963", "3"], ["1006", "1"], ["1064", "1"], ["1095", "1"], ["963", "http://www.google.com/1"], ["1003", "http://www.google.com/2"]] 

@links = @array.select { |item| item[1].match(/http/)} 
@non_links = @array - @links 
@non_links.map do |non_link| 
    if @links.map(&:first).include? non_link.first 
    [non_link.first, @links.select { |link| link.first == non_link.first }.first.last] 
    end 
end.compact