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I have a question about the part below. What does “change>0” do? I don’t understand what it’s for. Thanks!

// If there are no elements in change_arr or we have leftover change, return
  // the string "Insufficient Funds"
  if (change_arr.length < 1 || change > 0) {
    output.status = 'INSUFFICIENT_FUNDS';
    return output;
  }

It’s a comparison operator.

If your variable change has a value that is > (greater than) 0 it will evaluate to true.