"fold": a replacement for "reduce"

"Nordlöw" per.nordlow at gmail.com
Tue Mar 25 14:16:20 PDT 2014


> You have no guarantees that you'll have "stability" of the 
> returned type.

What do you mean with "stability" of the return type?

> More often than not, it *is* stable, but there are cases where 
> it is not.

Could you gives examples of when it's stable and when it's not?


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