Variable reduceRightConst

Type Declaration

• • <const Ar extends readonly unknown[], P>(
        array: Ar,
        callbackfn: (
            previousValue: P,
            currentValue: Ar[number],
            currentIndex: ArrayIndex<Ar>,
        ) => P,
        initialValue: P,
    ): P

  • Reduces an array to a single value from right to left.

    Type Parameters

    • const Ar extends readonly unknown[]
    • P

    Parameters

    • array: Ar
    • callbackfn: (previousValue: P, currentValue: Ar[number], currentIndex: ArrayIndex<Ar>) => P
    • initialValue: P

    Returns P

    Example

    const numbers = [1, 2, 3];
    
    const subtractRight = Arr.foldr(numbers, (acc, value) => acc - value, 0);
    const joinFromRight = Arr.foldr<number, string>(
      (acc, value) => `${acc}${value}`,
      '',
    )(numbers);
    
    assert(subtractRight === -6);
    assert(joinFromRight === '321');
    Copy

  • <E, P>(
        callbackfn: (
            previousValue: P,
            currentValue: E,
            currentIndex: Uint32,
        ) => P,
        initialValue: P,
    ): (array: readonly E[]) => P

  • Reduces an array to a single value from right to left.

    Type Parameters

    • E
    • P

    Parameters

    • callbackfn: (previousValue: P, currentValue: E, currentIndex: Uint32) => P
    • initialValue: P

    Returns (array: readonly E[]) => P

    Example

    const numbers = [1, 2, 3];
    
    const subtractRight = Arr.foldr(numbers, (acc, value) => acc - value, 0);
    const joinFromRight = Arr.foldr<number, string>(
      (acc, value) => `${acc}${value}`,
      '',
    )(numbers);
    
    assert(subtractRight === -6);
    assert(joinFromRight === '321');
    Copy