Programmer Humor

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submitted 9 months ago* (last edited 6 months ago) by [email protected] to c/[email protected]

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[–] [email protected] 1 points 9 months ago (1 children)

You can't random-access an iterator and use it again later.

If your specific use case really needs random access to a list while lazy computing the elements just wrap them in Lazy and put them in a vector.

Can Rust compute the value of calling a function an infinite number of times?

The return type of an infinitely recursive function / infinite loops is ⊥, a type that by definition has no values. (Known in rust as !)

[–] [email protected] 1 points 9 months ago

Haskell lets you infinitely recurse while still completing in finite time, and there's even a function (fix) for that. Doing e.g. fix (+ 2) would be an infinite loop if evaluated, yes, but fix (2 :) would give you a useful value that's an infinite stream of 2s. (it's also useful for other things too)