AI Code
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AI Code
// before — silently returns undefined on empty input
const avg = (xs) => xs.reduce((a, b) => a + b) / xs.length;
// after — explicit about the empty case
const avg = (xs) =>
xs.length === 0 ? null
: xs.reduce((a, b) => a + b, 0) / xs.length;Why it broke: reduce without an initial value throws on an empty array, and the division would return NaN even if it did not.
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