Until condition is true is not a negation or negative. But placing it
before the block implies pretesting as well. But adding a post-condition to
the block structure is a big change to the grammar tree structure as well,
just for one case, and really run-once before testing is not the most
common type of iteration done anyway.
Any which way it is implemented amounts to the same as having a boolean
flag declared as true prior to the loop, and flipping it after.
If there was a more concise conditional break you wouldn't even care there
wasn't a post test, such as this:
for {
statements()
break if condition()
}
instead of this:
for {
statements()
if condition() {
break
}
}
but you could just turn off automatic beautification and do this:
for {
statements()
if condition() { break }
}
On Friday, 11 May 2018 09:44:03 UTC+3, kortschak wrote:
>
> Until implies a negation. The presence of unless in perl is a horror
> resulting from the same semantics - I'm sure it seemed like a good idea
> at the time.
>
> On Thu, 2018-05-10 at 23:25 -0700, Louki Sumirniy wrote:
> > I think better to use the context of the english language for a
> > pre-condition checked after:
> >
> > until Condition() { ... }
> >
> > Or maybe just exactly mimics for, but does not test until after one
> > run of
> > the enclosed block:
> >
> > until Init(); Condition(); PostAssignment() { ... }
>
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