Not an answer to your specific question, but your #move... methods

look very odd.�� I think you meant something like

�� �� moveUpAFloor

�� �� �� floor := floor��+ 1.

�� �� moveDownAFloat

�� �� �� floor := floor - 1.

�� �� hasReachedBasement

�� �� �� ^floor = -1

AH!�� Now I see it.�� You are reporting the LAST time that the lift

reached the basement, but you were suppose to report the FIRST time.

You want

�� �� reachedBasement: input

�� �� �� input withIndexDo: [:element :index |

�� �� �� �� element = $( ifTrue: [self moveUpAFloor].

�� �� �� �� element = $) ifTrue: [self moveDownAFloor].

�� �� �� �� self hasReachedBasement ifTrue: [^index]]. "HERE"

�� �� �� ^0

Or using a standard linear-search method,

�� �� reachedBasement: input

�� �� �� |floor|

�� �� �� floor := 0. "ground"

�� �� �� ^input findFirst: [:each |

�� �� �� �� ��each = $( ifTrue: [floor := floor��+ 1]. "up"

�� �� �� �� ��each = $) ifTrue: [floor := floor - 1]. "down"

�� �� �� �� ��floor = -1 "basement"]

On Tue, 18 Dec 2018 at 09:49, Roelof Wobben <r.wobben@home.nl> wrote:

hello

I have this code

hasReachedBasement: aFloor
�� "comment stating purpose of message"

�� ^ aFloor = -1

initialize
�� "comment stating purpose of message"

�� super initialize.
�� position := 1.
�� floor := 0

moveFloorDown: aFloor
�� "comment stating purpose of message"

�� ^ floor := aFloor - 1

moveFloorUp: aFloor
�� "comment stating purpose of message"

�� ^ floor := aFloor + 1

reachedBasement: input2
�� input2
�� withIndexDo: [ :element :index |
�� element = $(
�� ifTrue: [ self moveFloorUp: floor ]
�� ifFalse: [ self moveFloorDown: floor ].
�� (self hasReachedBasement: floor)
�� ifTrue: [ position := index ] ].
�� position ifNotNil: [ ^ position ]

This works very fine with test input given by the challenge
but as soon as I do it with this :
https://gist.github.com/RoelofWobben/3be69976a6dd3531f01558b0ac563556

I see as answer : 6111 where I expect to see 1797

Anyone who can see what I did wrong ?

Roelof