Nested loops

[Alex Tweedly]

Direct equivalent is probably

repeat with i = 0 to myArrayLength-1
    put i-1 into j
    if j < 0 then put myArrayLength-1 into j
    .....
end repeat

OR, if you prefer a single-statement version

repeat with i = 0 to myArrayLength-1
    put (i + myArrayLength-1) mod myArrayLength  into j
    .....
end repeat

OR - most efficient but risky - i.e. a bad choice iMHO :-)

put myArrayLength-1 into j
repeat with i = 0 to myArrayLength-1
    .....
    put i into j   -- NB at the very end of the loop body
end repeat

This is risky in case you ever do a "next repeat" inside the loop body !!

Alex.

On 17/05/2022 07:35, jbv via use-livecode wrote:
> Hi list,
>
> What is the best and most efficient way to write the following
> javascript loops in LC ?
>
> for (let i = 0, j = myArray.length - 1; i < myArray.length; j = i++) {
> }
>
> This goes beyond simple nested loops.
> So far, because of lack of time, I have pre-calculated the successive
> values of i and j, and have put them into lists of words :
> 0 1 2 3 4 5
> 5 0 1 2 3 4
> it remains fast enough for what I need to do, but there must be a more 
> elegant approach...
>
> Thanks.
> jbv
>
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