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Feb 5th, 2016
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  1. array = [10, 20, 30, 40, 50, 55, 56, 57, 60]
  2. range = (1..10)
  3.  
  4. array.group_by #=> <Enumerator: [10, 20, 30, 40, 50, 55, 56, 57, 60]:group_by>
  5. range.group_by #=> <Enumerator: 1..10:group_by>
  6.  
  7.  
  8. array.group_by {|x| x % 10} #=> {0=>[10, 20, 30, 40, 50, 60], 5=>[55], 6=>[56], 7=>[57]}
  9. range.group_by {|v| v % 2} #=> {1=>[1, 3, 5, 7, 9], 0=>[2, 4, 6, 8, 10]}
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