S.I/Lisp/

REVERSE

=REVERSE(A1:A5)
-> A5:A1
        

DEFINE(
    REVERSE,
    LAMBDA(
        range,
        IF(
            ISVERTICAL(range),
            MAKEARRAY(
                ROWS(range),
                1,
                LAMBDA(
                    row,
                    _col,
                    INDEX(
                        range,
                        DECREMENT(
                            LENGTH(range),
                            DECREMENT(row)),
                        1))),
            MAKEARRAY(
                1,
                COLUMNS(range),
                LAMBDA(
                    _row,
                    col,
                    INDEX(
                        range,
                        1,
                        DECREMENT(
                            LENGTH(range),
                            DECREMENT(col))))))))
        

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