Walter Bright:

> Sure you can:
>      last_index = a.length - 1;

Probably my post was nearly useless, because it doesn't help much the 
development of D, so you can ignore most of it.
The only part of it that can be meaningful is that it seems Python designers 
have though that having a way to specify the _generic_ idea of start of a slice 
can be useful (with a syntax like a[:end] or a[None:end]) so in theory an 
equivalent syntax (like a[^..end]) can be added to D, but I have no idea if 
this is so commonly useful in D programs. If you notice in this thread I have 
not said that I like or dislike the 'complement to $' feature.

Regarding your specific answer here, storing a.length-1 in the index is not 
able to represent the idea of "last item". Another example to show you better 
what I meant:

last_index = -1
a = ['a', 'b', 'c']
b = [1.5, 2.5, 3.5, 4.5]
assert a[last_index] == 'c'
assert b[last_index] == '4.5'

I am not asking for this in D, I don't think there are simple ways to add this, 
and I don't need this often in Python too. I am just saying that the semantics 
of negative indexes in Python is a superset of the D one.

Bye,
bearophile

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