Analysis Playground

Division by `numbers.length` may be zero when array is empty

Static analysis traces that `numbers.length` can be 0 if an empty array is passed. Since there's no guard, this division could produce NaN or Infinity at runtime.

Division by `totalWeight` may be zero if all weights are 0

The accumulator `totalWeight` starts at 0 and only grows if weights contain non-zero values. Static analysis cannot prove this will always be non-zero.