TIL: That I can call the update function recursively in #elmlang. No idea why I thought that was off limits. Time to go improve some code!
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Recursive tail calls are the ONLY way to iterate in Elm. Unfortunately, JS doesn't tail call, so you must be simple to get a compiled loop.
For example. old_canResolve has three mutually-tail-recursive functions. It can stack overflow. canResolve fixes. https://github.com/billstclair/spokes/commit/27bb936d044cfa90aa84da0dd22a09efcf4d3f0a …
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Thanks for sharing (always good to know what to look out for). I was thinking of just using it for a single recursion, but will be cautious.
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Since those mutually-recursive functions are let-bound in a single outer function, the compiler COULD generate tail calls, but it doesn't.
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