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An Elo-based rating system for Stack Overflow
                
    Answers and rating deltas for
    Why is JS Map Function Returning Undefined?
| Author | Votes | Δ | 
|---|---|---|
| MrPizzaFace | 2 | +2.91 | 
| Karen Grigoryan | 2 | +2.82 | 
| some | 1 | -0.25 | 
| mxrxkx | 0 | -3.71 | 
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