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Date: Sun, 02 Nov 2014 14:44:54 -0800
From: Ray Andrews <rayandrews@eastlink.ca>
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To: zsh-users@zsh.org
Subject: Re: for loop question
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 <20141102213713.GA4412@chaz.gmail.com>
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On 11/02/2014 01:37 PM, Stephane Chazelas wrote:
> You could with:
>
> for ((i=1; (z[$([ -n "$TLC[i]" ])0]),$? == 0; i++))
>    print -ru2 -- $TLC[i]
>
> (not that you would want to).
No.  That is pure sadism ;-) ;-)

But it does show that 'for ((' CAN stop and digest  ' [ -n "$TLC[i]" ] 
'  if it wants too,
it just has to make it obscenely difficult. Why can't the truth test of 
a command just be taken
as 'arithmetic' plain and simple?

      $ for ((; 1 ;)) echo true!
      true!
      true!
      true!
      .....

      $ for ((; 0 ;)) echo true!
[nothing]

.... so why/how is it that the return value of  a ' [] ' test is NOT 
either 1 or 0?


Thanks for these, there is much  to learn from them:
> Here, you more likely want:
>
> for i ("$TLC[@]") print -ru2 -- $i
>
> or
>
> print -rlu2 -- "$TLC[@]"
>
> or:
>
> for ((i = 1; i <= $#TLC; i++)) print -ru2 -- $TLC[i]
>
>
> Or (to print only till the first empty element):
>
> for ((i = 1; $#TLC[i]; i++)) print -ru2 -- "$TLC[i]"
>
> Or:
>
> print -rlu2 -- "${(@)TLC[1,TLC[(i)]-1]}"
>