Re: [Pharo-users] what must be instead of the ??

[Roelof Wobben]

Op 9-11-2018 om 16:44 schreef Peter Uhnak: On Fri, Nov 9, 2018 at 1:26 PM Roelof Wobben <r.wob...@home.nl> wrote: Thanks all. This code seems to do the job santaFloorOnBasement     "calculates which step take Santa to the basement"      | index|      index := 1.       [floor ~= -1 ] whileTrue:          [ floor := ((input at: index) = '(' )                 ifTrue: [ floor + 1 ]                 ifFalse: [ floor - 1 ].          index := index + 1 ].               ^ index -1 You can also think of it from the perspective of data processing and not instruction coding (and mangling of indexes). stepChanges := input collect: [ :c | floor := floor + (c = '(' ifTrue: [ 1 ] ifFalse: [ -1 ]). floor ]. stepChanges detectIndex: [ :each | each = -1 ] ifNone: [ 'invalid input yo' ]. Peter oke, I see how it works, first you calculate all the floors Santa is visiting and then you look for the first -1. I have thought of something but I found it wierd that you do steps when you have already the answer. but how do I find now the answer do I have to do something like   puzzle1  stepChanges detectIndex ?  Roelof