feat(math): add Median, MedianBy, and MedianByErr#872
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Complete the statistical trio alongside Mean and Mode. Median returns the middle value of a sorted copy of the collection; even-length input averages the two middle elements with the same integer-truncation semantics as Mean. MedianByErr short-circuits on the first iteratee error without sorting a partial result.
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Summary
Median[T]— returns the median of a collection; sorts a copy, returns zero value for empty inputMedianBy[T, R]— projects each element via iteratee, then computes median on the projected valuesMedianByErr[T, R]— same as MedianBy but short-circuits on the first iteratee error without sorting a partial resultAll three follow the established
Mean/MeanBy/MeanByErrconventions exactly: same generic constraints, same empty-collection semantics, same integer-truncation behavior for even-length slices.Test plan
TestMedian: empty, odd-length, even-length, float casesTestMedianBy: mirrors TestMedian with identity iterateeTestMedianByErr: table-driven normal path (8 cases) + error path (3 cases) with iteratee call-count assertions verifying early exit🤖 Generated with Claude Code