F#: String.Split with a multi character delimeter
In my continued efforts at Roy Osherove’s TDD Kata I’ve been trying to work out how to split a string based on a delimeter which contains more than one character.
My original thinking was that it should be possible to do so like this:
I didn’t realise that splitting the string like that splits on each of the stars individually which means that we end up getting 2 empty values in the result:
val it : string  = [|"1"; ""; ""; "2"|]
If we want to split on '*' then we have to pass it in as a value in a string array:
"1***2".Split([| "***" |], StringSplitOptions.None);;
That way we only get the 1 and 2 which is what we want:
val it : string  = [|"1"; "2"|]
I’d expected there to be an overload which takes in a string and then just splits on that but since there isn’t this isn’t a bad alternative.
About the author
I'm currently working on real-time user-facing analytics with Apache Pinot at StarTree. I publish short 5 minute videos showing how to solve data problems on YouTube @LearnDataWithMark. I previously worked on graph analytics at Neo4j, where I also co-authored the O'Reilly Graph Algorithms Book with Amy Hodler.