19 09 2013
Just wanted to share a couple little functions that I was playing with since it made my code terse and readable. At first I needed a way to fold a function until a predicate. This way I could stop and didn’t have to continue through the whole list. Then I needed to be able to do the same kind of thing but choosing all elements up until a predicate.
First, folding. I wanted to be able to get all the characters up until white space. For example:
let (++) a b = a.ToString() + b.ToString() let upToSpaces str = foldTill Char.IsWhiteSpace (++) "" str
Which led me to write the following fold function. Granted it’s not lazy evaluated, but for me that was OK.
let foldTill check predicate seed list= let rec foldTill' acc = function |  -> acc | (h::t) -> match check h with | false… Read more