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Nov 13th, 2019
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  1. let a = [{'id': '1', 'num': '10'}, { 'id': '1', 'num': '10'}, {'id': '2', 'num': '5'}]
  2. //kalau id nya sama maka di data(num) di tambah,
  3.  
  4. //jadi hasilnya nanti jadi
  5. let a = [{'id': '1', 'num': '20'}, {'id': '2', 'num': '5'}]
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