Return null from avg of an empty array - #103

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SashaMIT wants to merge 1 commit into

jmespath:masterfrom

SashaMIT:fix/avg-empty-array

SashaMIT commented Oct 2, 2026 •

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Summary

avg of an empty array returned NaN. The sum is 0 and the length is 0, so the division is 0/0.
The spec says an empty array produces null. max and min of an empty array already return null. avg([]) now does too.
avg of [-1, 3, 4, 5] is still 2.75.

Test plan

go test -count=1 .
avg(empty_list) failed on master (float64(NaN), expected nil) and passes after the change.


          Return null from avg of an empty array

709f1d6

The spec says an empty array is null. The zero sum divided by zero
was NaN.

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