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Thanks! Good demonstration with the compare function. I guess in practice, I'd be fine calling that one impure then...

mb21
– mb21

2021-01-24 21:09:03 +00:00
Commented Jan 24, 2021 at 21:09
The Wikipedia article you quoted already notes: "Some authors, particularly from the imperative language community, use the term "pure" for all functions that just have the above property 2", which is still quite useful. So as long as you don't mutate the mutable argument (and no one else does) your function is still pure.

Bergi
– Bergi

2021-01-24 21:15:59 +00:00
Commented Jan 24, 2021 at 21:15
Also the part that refers to "mutable reference arguments" has been added in these edits and is not backed by a quotation from literate. There is also quite some discussion on the talk page.

Bergi
– Bergi

2021-01-24 21:26:31 +00:00
Commented Jan 24, 2021 at 21:26

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