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问题描述
从下面的哈希中，需要提取每个键的唯一值
array_of_hashes = [{'a' => 1，'b'=> 2，'c'=> 3}，
{'a'=> 4，'b'=> 5，'c'=> 3}，
{'a'=> 6，'b'=> 5，'c'=> 3}]
需要提取数组中每个键的唯一值
'a'的唯一值应该是
[1,4,6]
'b'的唯一值应该为
'c'的唯一值应给
[3]
想法？ 使用：
array_of_hashes = [{'a'=> 1，'b'=> 2，'c'=> 3}，
{'a'=> 4，'b'=> 5，'c'=> 3}，
{'a'=> 6，'b'=> 5，'c'=> 3}]
array_of_hashes.map {| h | h ['a']} .uniq＃=> [1,4,6]
array_of_hashes.map {| h | h ['b']} .uniq＃=> [2，5]
array_of_hashes.map {| h | h ['c']} .uniq＃=> [3]
From a hash like the below one, need to extract the unique values per key
array_of_hashes = [ {'a' => 1, 'b' => 2 , 'c' => 3} ,
{'a' => 4, 'b' => 5 , 'c' => 3},
{'a' => 6, 'b' => 5 , 'c' => 3} ]
Need to extract the unique values per key in an array
unique values for 'a' should give
[1,4,6]
unique values for 'b' should give
[2,5]
unique values for 'c' should give
[3]
Thoughts ?
解决方案
Use Array#uniq:
array_of_hashes = [ {'a' => 1, 'b' => 2 , 'c' => 3} ,
{'a' => 4, 'b' => 5 , 'c' => 3},
{'a' => 6, 'b' => 5 , 'c' => 3} ]
array_of_hashes.map { |h| h['a'] }.uniq # => [1, 4, 6]
array_of_hashes.map { |h| h['b'] }.uniq # => [2, 5]
array_of_hashes.map { |h| h['c'] }.uniq # => [3]
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