foldIn (method)

foldIn

• foldIn<U, R>(this, f, initial): Opt<R>

• Applies a reducer function to an array within an Opt instance, combining its elements into a single value using the array's reduce method.

  Type Parameters

  • U

  • R

  Parameters

  • this: Opt<U[]>

  • f: ((acc, x) => R)

    • • (acc, x): R

      • Parameters

        • acc: R

        • x: U

        Returns R

  • initial: R

  Returns Opt<R>

  Example

  opt([1, 2, 3]).foldIn((acc, x) => acc + x, 0) // Some(6)
  none.foldIn((acc, x) => acc + x, 0) // None