CODEWITHSUNDEEP
f#
Jamie Dixon
Jamie Dixon

Reputation: 4302

Seq.Fold -> the best way to apply a count down?

I have a Seq like this:

[(1, 0, 10); (5, 1, 10); (5, 0, 10); (8, 1, 10); ...]

And I want to decrease the third element in the tuple by one every time the second element is a 1

[(1, 0, 10); (5, 1, 9); (5, 0, 9); (8, 1, 8); ...]

I was thinking Seq.Fold b/c I need an accumulator but I am not sure how to implement. Am I on the right track?

Upvotes: 0

Views: 135

Answers (2)

eulerfx
eulerfx

Reputation: 37739

You just need a map:

[(1, 0, 10); (5, 1, 10); (5, 0, 10); (8, 1, 10); ...] 
|> List.map (function (first,second,third) when second = 1 -> (first,second,third - 1) | other -> other)

Upvotes: 2

Jamie Dixon
Jamie Dixon

Reputation: 4302

I was close, but using the wrong function

Seq.Scan does the trick....

Upvotes: -1

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