
{{alias}}( arrays, shape, fcn )
    Applies a unary callback to elements in a four-dimensional nested input
    array and assigns results to elements in a four-dimensional nested output
    array.

    Parameters
    ----------
    arrays: ArrayLikeObject
        Array-like object containing one input nested array and one output
        nested array.

    shape: Array<integer>
        Array shape.

    fcn: Function
        Unary callback.

    Examples
    --------
    > var x = [ [ [ [ -1.0, -2.0 ], [ -3.0, -4.0 ] ] ] ];
    > var y = [ [ [ [ 0.0, 0.0 ], [ 0.0, 0.0 ] ] ] ];
    > var shape = [ 1, 1, 2, 2 ];
    > {{alias}}( [ x, y ], shape, {{alias:@stdlib/math/base/special/abs}} );
    > y
    [ [ [ [ 1.0, 2.0 ], [ 3.0, 4.0 ] ] ] ]

    See Also
    --------

