mapItems

Creates a map items transformation action.

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

Generics

• TInput extends ArrayInput
• TOutput extends any

Parameters

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

Explanation

With mapItems you can apply an operation to each item in an array to transform it.

Returns

• Action MapItemsAction<TInput, TOutput>

Examples

The following examples show how mapItems can be used.

Mark duplicates

const MarkedArraySchema = v.pipe(
  v.array(v.string()),
  v.mapItems((item, index, array) => {
    const isDuplicate = array.indexOf(item) !== index;
    return { item, isDuplicate };
  })
);

Related

The following APIs can be combined with mapItems.

Schemas

• any,
• array,
• custom,
• instance,
• tuple,
• unknown

Methods

• pipe

Utils

• isOfKind,
• isOfType