reduceItems

Creates a reduce items transformation action.

const Action = v.reduceItems<TInput, TOutput>(operation, initial);

Generics

operation (output: TOutput, item: TInput[number], index: number, array: TInput) => TOutput
initial TOutput

With reduceItems you can apply an operation to each item in an array to reduce it to a single value.

The following examples show how reduceItems can be used.

Schema that sums all the numbers in an array.

const SumArraySchema = v.pipe(
  v.array(v.number()),
  v.reduceItems((sum, item) => sum + item, 0)
);

The following APIs can be combined with reduceItems.