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worldofprasanna/array_to_hash.rb

Created November 7, 2015 16:30
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Snippet to convert Array to Hash with duplicate elements combined together
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array_to_hash.rb
def array_to_hash(arr)
hash_val = Hash.new
arr.uniq.each {|n| hash_val[n] = arr.grep(n)}
hash_val
end
# array_to_hash([1,2,3,2,1]) => {1=>[1, 1], 2=>[2, 2], 3=>[3]}
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