Function firstMap

Applies function to the elements of iterator and returns the first non-none result.

firstMap(fn) is the lighter version of filterMap(fn).first().

  • firstMap<T, U>(arr, fn, thisArg?): Option<U>

  • Type Parameters

    • T
    • U

    Parameters

    • arr: T[]

      An array

    • fn: ((value: T, index: number, array: T[]) => Option<U>)

      A function that produces an Option.

        • (value, index, array): Option<U>

        • Parameters

          • value: T
          • index: number
          • array: T[]

          Returns Option<U>

    • OptionalthisArg: any

      If provided, it will be used as the this value for each invocation of predicate. If it is not provided, undefined is used instead.

    Returns Option<U>

    The first non-none result.

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