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Added corecursion example

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Brandon Rozek 2022-11-23 01:02:36 -05:00
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content/blog/corecursion-unfold-infinite-sequences.md
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@ -145,6 +145,13 @@ Notice how the function within `unfold` needs to return an `Option`. If the retu
val countdown = (n: Int) => Iterator.unfold(n)(x => if x == -1 then None else Some((x, x - 1))) val countdown = (n: Int) => Iterator.unfold(n)(x => if x == -1 then None else Some((x, x - 1)))
``` ```
**(4) Repeat an element forever**
For this example, we don't need to carry any state throughout hte computation.
```scala
val repeat: (Int => Iterator[Int]) = (n) => Iterator.unfold(None)(_ => Some(n, None))
```
## Recursive Sequences ## Recursive Sequences
In the past, [I've written](/blog/haskellrealsequences/) about analyzing sequences from real analysis within Haskell. Within it, I was looking at the following sequence: In the past, [I've written](/blog/haskellrealsequences/) about analyzing sequences from real analysis within Haskell. Within it, I was looking at the following sequence: