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Schoening

Slow Reaction.. or Loop +1 [Solved]

11 posts in this topic

#1 ·  Posted (edited)

I am doing some Loops, and realized that sometimes the Loop repeats 1 more time than intended, even though the Until is forfilled.

Why is that?

Edit: "The expression is tested after the loop is executed, so the loop will be executed one or more times."

Perhaps that solves the Why.. but not how to prevent it

Edited by Schoening

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#3 ·  Posted (edited)

Edit: JohnOne is right; initially I thought you were using the While/Wend.

Edited by enaiman

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had to rewrite and sacrifice some stuff but works now :) thx

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#6 ·  Posted (edited)

The expression 'For $i = 1 To 5' will execute the code contained within the loop 5 times, since the script exits the loop when $i becomes equal to 6. There is no mystery here. The only confusion occurs when looping through a zero based array (or something similar). Then you would generally write something like 'For $i = 0 To 4'. This loop also runs 5 times and stops when $i becomes equal to 5.

Edited by czardas

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If I may add a thought to czardas's contribution here: The fact that your variable, $i, is used to loop say from '1 to 5' then the loop exits but outside of the loop $i = 6 is occasionally potentially handy; if you have a condition which may exit the loop early and you know that "For $i = 1 To 5" then you can test "If $i < 6" outside of the loop for proof of the loop's full cycle.

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If I may add a thought to czardas's contribution here: The fact that your variable, $i, is used to loop say from '1 to 5' then the loop exits but outside of the loop $i = 6 is occasionally potentially handy; if you have a condition which may exit the loop early and you know that "For $i = 1 To 5" then you can test "If $i < 6" outside of the loop for proof of the loop's full cycle.

How certain are you of that?

Is $i a Global/Local variable, or is it just a counter which exista only

in that loop?


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How certain are you of that?

Is $i a Global/Local variable, or is it just a counter which exista only

in that loop?

I'm sorry, I did not expand on the assumption of what I meant '...you know that "For $i = 1 To 5"...' If you Know that the $i you are testing is the same $i in the same scope then you can use that variable in that way. If I am not able to keep track of whether a variable I am testing at the moment is the correct name for the variable I mean to reference in that scope or not then it might be best to carefuly to name every variable I use, in any project (in case a project is modified to support the possiblity of being utilized in part by other projects), a completely unique name every time, just to be sure. Perhaps something like "$the_integer_for_counting_the_number_of_times_I_looped_in_function_A_of_script_scriptadoodle", but now I'm just being silly because honestly, I meant in that statement a case where the individual is aware of what scope the variable being referenced is in and the "$i" was used as an example name only because I didn't have any more specific case in mind like "$iRowCount" or "$iLikeCountingLoops".

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JohnOne,

I am absolutely certain. :)

From the Help file page for For...To...Step...Next:

"The Variable will be created automatically with a LOCAL scope, even when MustDeclareVars is on"

So the Variable will always have the value of stop + 1 if it runs through the loop without interruption. ;)

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