sum

sum(array) → number · Math

Sum all numeric values in an array. Returns 0 for empty arrays.

• array (required): array of numbers

sum([10, 20, 30])                        // 60
sum([])                                  // 0 (empty array)

Anti-pattern: reduce($input.items, 0, (acc, i) -> acc + i.price) — use sum(map(...)) or sumBy().