Flowdock
method

group_by

Importance_2
group_by() public

Returns a hash, which keys are evaluated result from the block, and values are arrays of elements in enum corresponding to the key.

If no block is given, an enumerator is returned instead.

(1..6).group_by {|i| i%3}   #=> {0=>[3, 6], 1=>[1, 4], 2=>[2, 5]}
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February 12, 2016
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group on hash

def group_by_hash hash, value
  hash.group_by do |k,v| 
    v > value ? "Big" : "Small"
  end
end

marks = {"Chair" => 30, "Table" => 40, "Bed" => 60, "stool" => 20}
group_by_hash(marks, 30)