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$\begingroup$ I don't understand ... so what, basically we can't use arrays ?? $\endgroup$
– redjamjar
Commented Oct 10, 2023 at 20:02
1

$\begingroup$ @redjamjar: You can use arrays, but only in safe ways. $\endgroup$
– Andrej Bauer
Commented Oct 10, 2023 at 20:54
1

$\begingroup$ @redjamjar you can write programs with arrays, but you can't reason about them. $\endgroup$
– ice1000 ♦
Commented Oct 10, 2023 at 21:23
$\begingroup$ @ice1000: Would you really say that? If you provide proofs of correctness of indices, as you should, you can reason about arrays. $\endgroup$
– Andrej Bauer
Commented Oct 11, 2023 at 5:34
1

$\begingroup$ @AndrejBauer you're right. I should say you can't reason about them as naturally as you could reason about lists -- you would pay extra effort to do so. $\endgroup$
– ice1000 ♦
Commented Oct 11, 2023 at 6:05

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