String splitting: Difference between revisions
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'''Problem'''. You need to split a string into different parts. For example you may split a long text into lines or split the fields of a CSV line into records. You are probably looking around for something called '''split'''; it will not work, read on. |
'''Problem'''. You need to split a string into different parts. For example you may split a long text into lines or split the fields of a CSV line into records. You are probably looking around for something called '''split'''; it will not work, read on. |
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'''Solution'''. The easiest fix is to use send aString a '''findTokens:''' message. It is just an unusual name for something most of programming languages call ''split''. The following example shows how to use '''findTokens:''' and its cousin '''findTokens:keep:'''. |
'''Solution'''. The easiest fix is to use send aString a '''findTokens:''' message. It is just an unusual name for something most of programming languages call ''split''. The following example shows how to use '''findTokens:''' and its cousin '''findTokens:keep:'''.<syntaxhighlight lang="smalltalk"> |
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'hello world' findTokens: ' '. " an OrderedCollection('hello' 'world') " |
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'hello world' findTokens: ' '. " an OrderedCollection('hello' 'world') " |
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'foo,bar,baz' findTokens: ','. " an OrderedCollection('foo' 'bar' 'baz') " |
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| ⚫ | '''note'''. For months I have been using ''Cuis'' without knowing this fundamental method. I was using ''Regex'' to fill the gap, but it is like shooting a mosquito with a cannon. This stressed two points: 1) If you choose unusual names for your code poeple will not find/get you 2) ''Squeak'' ''Method Finder'' could be useful also in ''Cuis''. |
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| ⚫ | </syntaxhighlight>'''note'''. For months I have been using ''Cuis'' without knowing this fundamental method. I was using ''Regex'' to fill the gap, but it is like shooting a mosquito with a cannon. This stressed two points: 1) If you choose unusual names for your code poeple will not find/get you 2) ''Squeak'' ''Method Finder'' could be useful also in ''Cuis''. |
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----Dr. Nicola Mingotti wrote this page in 03-Dec-2021. Tested in Cuis5.0-4963.image. |
----Dr. Nicola Mingotti wrote this page in 03-Dec-2021. Tested in Cuis5.0-4963.image. |
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Latest revision as of 19:55, 12 May 2025
Problem. You need to split a string into different parts. For example you may split a long text into lines or split the fields of a CSV line into records. You are probably looking around for something called split; it will not work, read on.
Solution. The easiest fix is to use send aString a findTokens: message. It is just an unusual name for something most of programming languages call split. The following example shows how to use findTokens: and its cousin findTokens:keep:.
'hello world' findTokens: ' '. " an OrderedCollection('hello' 'world') "
'hello world' findTokens: ' '. " an OrderedCollection('hello' 'world') "
'foo,bar,baz' findTokens: ','. " an OrderedCollection('foo' 'bar' 'baz') "
'foo,bar,baz' findTokens: ',' keep: ','. " an OrderedCollection('foo' ',' 'bar' ',' 'baz') "
'foo,bar,,baz' findTokens: ',' keep: ','. " an OrderedCollection('foo' ',' 'bar' ',' ',' 'baz') "
note. For months I have been using Cuis without knowing this fundamental method. I was using Regex to fill the gap, but it is like shooting a mosquito with a cannon. This stressed two points: 1) If you choose unusual names for your code poeple will not find/get you 2) Squeak Method Finder could be useful also in Cuis.
Dr. Nicola Mingotti wrote this page in 03-Dec-2021. Tested in Cuis5.0-4963.image.