Returns a new array only with the elements with a corresponding True in bool_array.

    Parameters
    ----------
    array : numpy.ndarray or WeldObject
        Input data.
    weld_type : WeldType
        Type of the elements in the input array.
    bool_array : numpy.ndarray or WeldObject
        Array of bool with True for elements in array desired in the result array.

    Returns
    -------
    WeldObject
        Representation of this computation.

def weld_filter(array, weld_type, bool_array):
    """Returns a new array only with the elements with a corresponding True in bool_array.

    Parameters
    ----------
    array : numpy.ndarray or WeldObject
        Input data.
    weld_type : WeldType
        Type of the elements in the input array.
    bool_array : numpy.ndarray or WeldObject
        Array of bool with True for elements in array desired in the result array.

    Returns
    -------
    WeldObject
        Representation of this computation.

    """
    obj_id, weld_obj = create_weld_object(array)
    bool_obj_id = get_weld_obj_id(weld_obj, bool_array)

    weld_template = """result(
    for(
        zip({array}, {bool_array}),
        appender[{type}],
        |b: appender[{type}], i: i64, e: {{{type}, bool}}| 
            if (e.$1, 
                merge(b, e.$0), 
                b)
    )
)"""

    weld_obj.weld_code = weld_template.format(array=obj_id,
                                              bool_array=bool_obj_id,
                                              type=weld_type)

    return weld_obj