CODEWITHSUNDEEP
rubyhashenumerable
Rei Jarram
Rei Jarram

Reputation: 1004

How do I transpose two hashes in ruby to make a single hash or array?

I want to take the two hashes below and combine them into a new hash or array:

hash1 = {1=>"]", 2=>"}", 3=>")", 4=>"(", 5=>"{", 6=>"["}
hash2 = {1=>"[", 2=>"{", 3=>"(", 4=>")", 5=>"}", 6=>"]"}

I want the result to look something like this:

result = {"["=>"]", "{"=>"}", "("=>")"}

or

result = [ ["[","]"], ["{","}"], ["(",")"] ]

Is there a ruby method that can do this?

Upvotes: 1

Views: 267

Answers (4)

sawa
sawa

Reputation: 168199

hash1.merge(hash2){|_, v1, v2| [v1, v2]}.values
# => [["]", "["], ["}", "{"], [")", "("], ["(", ")"], ["{", "}"], ["[", "]"]]

Upvotes: 0

Sajad Rastegar
Sajad Rastegar

Reputation: 3154

hash1.each_with_object({}) { |(k, v), h| h[hash2[k]] = v }

#=> {"["=>"]", "{"=>"}", "("=>")", ")"=>"(", "}"=>"{", "]"=>"["}

Or:

hash2.each_with_object({}) { |(k, v), h| h[v] = hash1[k] }

#=> {"["=>"]", "{"=>"}", "("=>")", ")"=>"(", "}"=>"{", "]"=>"["}

Upvotes: 1

alexts
alexts

Reputation: 180

Well, another way you can get what you want is by using Hash#deep_merge like so:

res = hash1.deep_merge(hash2) { |key, this_val, other_val| [other_val , this_val] }.values
# =>  [["[", "]"], ["{", "}"], ["(", ")"], [")", "("], ["}", "{"], ["]", "["]
res.first(3) 
# => [["[", "]"], ["{", "}"], ["(", ")"]]

Upvotes: 1

iGian
iGian

Reputation: 11193

You could use Hash#transform_keys:

res = hash1.transform_keys { |k| hash2[k] }

res #=> {"["=>"]", "{"=>"}", "("=>")", ")"=>"(", "}"=>"{", "]"=>"["}

res.first(3) #=> [["[", "]"], ["{", "}"], ["(", ")"]]

Upvotes: 4

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