Aggregation

max, min and average return undefined for an empty array; sum returns 0.

sumAggregation

sum(items: number[]): number

Sum of the numbers (0 for an empty array).

maxAggregation

max(items: number[]): number

Largest number (`undefined` for an empty array).

minAggregation

min(items: number[]): number

Smallest number (`undefined` for an empty array).

averageAggregation

average(items: number[]): number

Arithmetic mean (`undefined` for an empty array).

sum

sum(items: number[]): number

Sum of the numbers (0 for an empty array).

total: sum(order.prices)

max

max(items: number[]): number

Largest number (undefined for an empty array).

priciest: max(order.prices)

min

min(items: number[]): number

Smallest number (undefined for an empty array).

cheapest: min(order.prices)

average

average(items: number[]): number

Arithmetic mean (undefined for an empty array).

mean: average(order.prices)

Playground

Mapping✔Playground ↗

input order: { prices: number[] }

map {
  total: sum(order.prices),
  cheapest: min(order.prices),
  priciest: max(order.prices),
  mean: average(order.prices),
}

input order: { prices: number[] } map { total: sum(order.prices), cheapest: min(order.prices), priciest: max(order.prices), mean: average(order.prices), }

Input JSON

{ "prices": [19.99, 5.5, 12.25] }

{ "prices": [19.99, 5.5, 12.25] }

Output

{
  "total": 37.739999999999995,
  "cheapest": 5.5,
  "priciest": 19.99,
  "mean": 12.579999999999998
}

inferred type{ total: number; cheapest: number; priciest: number; mean: number; }