CODEWITHSUNDEEP
crystal-lang
waghanza
waghanza

Reputation: 173

Deep merging hash (adding values)

I need to merge several hashes. I mean having: 

a = {:x => 72, :y => 2}
b = {:x => 34, :y => 24}
c = a.deep_merge!(b)

and c is {:x => 106, :y => 26}.

Is there a feature in Crystal like deep_merge in Ruby?

EDIT : The real hash is more complex

{"request" => {"duration" => 15100012.0, "total" => 252562.0, "per_second" => 16725.0, "bytes" => 43440664.0}, "error" => {"socket" => 0.0, "read" => 25.0, "write" => 0.0, "http" => 0.0, "timeout" => 0.0}, "latency" => {"minimum" => 234.0, "maximum" => 219466.0, "average" => 7640.0, "deviation" => 12940.0}, "percentile" => {"fifty" => 2732.0, "ninety" => 20335.0, "ninety_nine" => 65824.0, "ninety_nine_ninety" => 199536.0}}

in fact it's a json transformed in a hash with PullParser

my final goal is to add create a new hash composed by values (added) from this hash on a loop

Upvotes: 1

Views: 175

Answers (1)

felixbuenemann
felixbuenemann

Reputation: 639

What you are describing is not a deep merge (a recursive operation), but just a custom merge strategy.

It can be solved by calling Hash#merge with a block:

a = {:x => 72, :y => 2}
b = {:x => 34, :y => 24}
c = a.merge(b) { |_, v1, v2| v1 + v2 }
pp c # => {:x => 106, :y => 26}

Upvotes: 4

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