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Answers and rating deltas for
I need to calculate the sum of columns in an array with objects
| Author | Votes | Δ |
|---|---|---|
| sjahan | 3 | +1.05 |
| Женя Борісевіч | 0 | +0.64 |
| Maheer Ali | 0 | -0.71 |
| Lucas Charvolin | -1 | -3.40 |
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