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Python-based monads essay (Re: Assignment versus binding)

Steve D'Aprano steve+python at pearwood.info
Wed Oct 12 20:02:37 EDT 2016 
On Wed, 12 Oct 2016 11:52 pm, Gregory Ewing wrote:

> Steven D'Aprano wrote:
>> "the implementation is free to use in-place mutations of the state object
>> – ... without letting anyone know that the implementation has given up
>> any functional purity."
> 
> If it's impossible to tell that functional purity has
> been given up, then in what sense has it been given up
> at all?

Did I say it was impossible to tell?

Just because Donald Trump doesn't admit to wearing a hairpiece doesn't mean
that nobody can tell that he does. *wink*

The way you can usually tell your functional language has given up purity in
favour of mutating implementations is that your code actually runs with
non-toy amounts of data :-)




-- 
Steve
“Cheer up,” they said, “things could be worse.” So I cheered up, and sure
enough, things got worse.
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