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Mar 17th, 2018
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  1. irb(main):001:0> l = []
  2. => []
  3. irb(main):002:0> s = "hello"
  4. => "hello"
  5. irb(main):003:0> l += s
  6. TypeError: can't convert String into Array
  7. from (irb):3:in `+'
  8. from (irb):3
  9. irb(main):004:0>
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