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2 hash:
h1 = { "s1" => "2009-7-27", "s2" => "2010-3-6", "s3" => "2009-7-27" }
h2 = { "s1" => "12:29:15", "s2" => "10:00:17", "s3" => "12:25:52" }
I want to merge the two hash as one like this:
h = { "s1" => "2009-7-27 12:29:15",
"s2" => "2010-3-6 10:00:17",
"s3" => "2009-7-27 2:25:52" }
what is the best way to do this? thanks!
685
We can merge two hashes using the merge() method. When using the merge() method: Each new entry is added to the end. Each duplicate-key entry's value overwrites the previous value.
Hash#merge!() is a Hash class method which can add the content the given hash array to the other. Entries with duplicate keys are overwritten with the values from each other_hash successively if no block is given.
Can a hash have multiple values Ruby? Each key can only have one value. But the same value can occur more than once inside a Hash, while each key can occur only once.
Equality—Two hashes are equal if they each contain the same number of keys and if each key-value pair is equal to (according to Object#== ) the corresponding elements in the other hash. The orders of each hashes are not compared. Returns true if other is subset of hash.
h = h1.merge(h2){|key, first, second| first + " " + second }
It will work if your keys are the same. In your code, they aren't ("s1" vs "s1="). Are they supposed to be the same keys?
170
You mean:
Hash[h1.map{|k,v| [k, "#{v} #{h2[k]}"]}]
=> {"s3"=>"2009-7-27 12:25:52", "s1"=>"2009-7-27 12:29:15", "s2"=>"2010-3-6 10:00:17"}
Note hashes are unordered, if you want an ordered hash you probably need to look at this
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