CODEWITHSUNDEEP
arraysrubyhash
user5125652
user5125652

Reputation: 13

How to find the minimum value from the ranges in array of hashes in ruby?

I have the below array of hashes 

z = {"RANGE"=>[{"10-50"=>"5"}, {"50-100"=>"15"}, {"100-150"=>"25"}]}

How can I get output as 10

Upvotes: 1

Views: 1481

Answers (2)

potashin
potashin

Reputation: 44581

You can try the following:

z["RANGE"].map(&:keys).flatten.map(&:to_i).min
#=> 10

Demo

Upvotes: 2

Cary Swoveland
Cary Swoveland

Reputation: 110675

z["RANGE"].map { |h| h.first.first.to_i }.min #=> 10

Alternatively, to avoid the construction of a temporary array:

z["RANGE"].min_by { |h| h.first.first.to_i }.first.first.to_i #=> 10

Note: "10-50".to_i #=> 10.

Postscript: considering how often one sees hashes having at most one key-value pair, perhaps we could use some Hash methods for working with them specifically. For example:

class Hash
  def only_key
    raise StandardError, "Hash has > 1 keys" if size > 1
    first.first
  end
  def only_value
    raise StandardError, "Hash has > 1 keys" if size > 1
    first.last
  end
end

We could then write:

z["RANGE"].map { |h| h.only_key.to_i }.min #=> 10

and if we wanted the smallest value:

z["RANGE"].map { |h| h.only_value.to_i }.min #=> 5

Upvotes: 2

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