CODEWITHSUNDEEP
recursionfunctional-programmingsignalselm
user2452478
user2452478

Reputation: 113

Elm Recursive Mapping?

I'm trying to write a game of life clone in Elm and I've got some difficulty with how to draw an updating board.

I represent the cells on the board as (List (List Int)) in a variable called gameBoardList

I use this function to update the board

transformBoardList : List (List Int) -> List (List Int)
transformBoardList l = nextVertRow l 0

I'm able to turn the gameBoardList into a form and draw it as an element, and even apply the transformBoardList function to that without an issue.

What I don't understand is how I can have my board updating constantly. I've checked out the past dependent mapping but it looks to me like I need some sort of recursive mapping so I can keep applying transformBoardList every update

Any ideas how I can achieve this?

Upvotes: 2

Views: 497

Answers (1)

Apanatshka
Apanatshka

Reputation: 5958

If you have some game state, and an update function, you can use those and foldp and a time ticker to get a regularly updating game. 

startState = gameBoardList -- for example
update = transformBoardList -- for example
view = .. -- you said you had this too

input = Time.every second -- a time ticker
state = Signal.foldp (\_ s -> update s) startState input
main = view <~ state

Upvotes: 1

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