Function useArrayReduce

packages/shared/useArrayReduce/index.ts:46–61

(
  list: MaybeRefOrGetter<MaybeRefOrGetter<T>[]>,
  reducer: ((...p: any[]) => any),
  ...args: any[]
)

 * @returns the value that results from running the "reducer" callback function to completion over the entire array.
 */
export function useArrayReduce<T>(
  list: MaybeRefOrGetter<MaybeRefOrGetter<T>[]>,
  reducer: ((...p: any[]) => any),
  ...args: any[]
): ComputedRef<T> {
  const reduceCallback = (sum: any, value: any, index: number) => reducer(toValue(sum), toValue(value), index)

  return computed(() => {
    const resolved = toValue(list)
    // Depending on the behavior of reduce, undefined is also a valid initialization value,
    // and this code will distinguish the behavior between them.
    return args.length
      ? resolved.reduce(reduceCallback, typeof args[0] === 'function' ? toValue(args[0]()) : toValue(args[0]))
      : resolved.reduce(reduceCallback)
  })
}