increment/decrement operators
Ian Kelly
ian.g.kelly at gmail.com
Mon Dec 7 19:24:44 EST 2015
On Dec 5, 2015 10:21 AM, "BartC" <bc at freeuk.com> wrote:
>
>
> The latter is not the same. Some of the differences are:
>
> * ++ and -- are often inside inside expressions and return values (unlike
x+=1 in Python)
>
> * x++ and x-- return the /current/ value of x, unlike x+=1 even if it
were to return a value; it would be the new value
Since x+=1 is not an expression, this is moot.
> * x+=1 requires you to hard-code the value 1, but ++ is not necessarily
stepping by 1. You can imagine ++ stepping something to its next value.
Note that x+=1 does not necessarily have to mean stepping by 1 either. You
could even do something like x+=5 to mean skip the next four values and
step x to the value after that.
> However, if ++ and -- are only used as statements, then why not simply
map them to x+=1? In Python, that would need to be x++ and x-- as ++x or
--x have existing meanings.
I think a better question is if they're only going to be statements, then
why bother adding them? x++ doesn't give you anything you can't get from
x+=1, so why commit to supporting the extra syntax?
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