(1) As it happens, my Smalltalk library *does* have #excludes: and #identityExcludes: (2) The definitions are trivial. excludes: item ^(self includes: item) not identityExcludes: item ^(self identityIncludes: item) not If you want to execute aBlock when aString is not all zeros and ones, just do (aString allSatisfy: [:each | each = $0 or: [each = $1]]) ifFalse: [aBlock value]. or (aString anySatisfy: [:each | each ~= $0 and: [each ~= $1]]) ifTrue: [aBlock value]. or ('01' includesAll: aString) ifFalse: [aBlock value]. On Sat, 16 Mar 2019 at 11:33, Tim Mackinnon <tim@testit.works> wrote:
Hi - in my quest to understand the edgier details of Pharo (and Smalltalk) - and driven by fresh thoughts of completing exercism exercises - I was surprised to find that there is no #excludes: operation on collection to mirror the #includes: operation?
I was curious about this - its seems a strange omission?
Of course I can inverse it with not, or do things a different way - but we have ifTrue: mirrored with ifFalse, empty/notEmpty so am I missing something?
I wanted to write something like
aString detect: [:c | ($0 to: $1) excludes: c] ifFound: aBlock. (Evaluate a block if the string isnât all 0 and 1âs)
Of course I can write this as:
(aString reject: [:c | c = $0 | c = $1)) ifNotEmpty: aBlock
But as recent messages in this vein have shown me (and taught me lots - thanks to those answering), the answer is often not what I thought.
Tim