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Keep working on a language spec.

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Scott Richmond 2023-12-14 00:19:25 -05:00
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language.md
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@ -303,7 +303,20 @@ let baz = :b (foo) :d & `baz` is now "baz"
Ludus will have optimized tail calls--the most straightforward way to accomplish repeating behaviour is function recursion. There are two additional looping forms, `repeat` and `loop`.
### `repeat`
`repeat` is a help to learners, and is useful for making
`repeat` is a help to learners, and is useful for executing side effects multiple times. It is written `repeat {number|word} { {exprs} }`. From turtle graphics:
```
repeat 4 {
forward! (100)
right! (0.25)
}
```
Note that `repeat` does two interesting things:
1. It never returns a value other than `nil`. If it's in the block, it disappears.
2. Unlike everything else in Ludus, it requires a block. You cannot write `repeat 4 forward (100)`. (Watch this space.)
### `loop`/`recur`
## Environment and context: the toplevel