The reason I like this is that it lets you turn fold into sum easily, something like,
let fold collection initial f =
let mutable res = initial
for item in collection do
res <- f res item
res
let sum (numbers: #INumber<'t>) = fold numbers (INumber<'t>.Zero) (+)
let product (numbers: #INumber<'t>) = fold numbers (INumber<'t>.One) (*)
or however that syntax is going to work out. Then there are a lot of other things you can do with that sort of pattern. Being able to write more complex stuff, like weighted average and standard deviation, is pretty hot.
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You are absolutely right, thanks for pointing that!
Indeed my example might not have been the most explicit one, I should have talked about summing only taxes (double) to avoid confusion
The reason I like this is that it lets you turn
foldintosumeasily, something like,or however that syntax is going to work out. Then there are a lot of other things you can do with that sort of pattern. Being able to write more complex stuff, like weighted average and standard deviation, is pretty hot.