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

On Fri, Nov 9, 2018 at 1:26 PM Roelof Wobben <r.wobben@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