sumBy

sumBy(array, fn) → number · Math

Sum values extracted from an array of objects using a key function.

• array (required): array of objects

• fn (required): lambda (element) -> number

echo '{"items": [{"qty": 2, "price": 25}, {"qty": 5, "price": 10}, {"qty": 1, "price": 100}]}' | utlx -e 'sumBy($input.items, (i) -> i.qty * i.price)'
# 200

{
  orderTotal: sumBy($input.items, (i) -> i.qty * i.price)
}