Let's try to summarize:
1. The loop variable in a Vim9 script and a compiled function behave
differently, we expect them to work the same way. In a script the
variable can't be found after the loop, it has been deleted. In a
compiled function it can be used by a closure executed later.
-> In a script make the loop variable available also after the loop
has finished.
2. Assuming the loop variable can be used, the value is what it was last
set to, thus when using "for i in range(4)" it will be 3. Other
language do this too, thus it would be acceptable. But it is not
very useful (esp. since the variable is read-only, a closure cannot
change it). One exception: if the loop can be exited early, then the
last value could be useful:
for i in range(100)
if i == 0
timer_start(1000, (_) => {
echowin 'last count is ' i
})
endif
if i == 5
break
endif
endfor
-> Documenting this would be sufficient.
3. It is common to use the current value of the loop variable, not
the final value. There should be an easy way to do that. That would
be making a copy in a block-local variable (Python also mentions
this).
At the script level this works, but only by explicitly using a {}
block, not by declaring the variable in the for-endfor block.
In a compiled function this doesn't currently work.
-> Make this work both in a script and compiled function:
for i in range(4)
var ii = i
timer_start(1000, (_) => {
echowin 'current count is ' ii
})
endfor
This would show the values 0, 1, 2 and 3.
We could change the choice in the second one, but implementing that
efficiently actually isn't so easy.
--
The future isn't what it used to be.
/// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net \\\
/// \\\
\\\ sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ ///
\\\ help me help AIDS victims -- http://ICCF-Holland.org ///
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