Step Description Expression

[j_dodek]

Hi

I am adding some features to a custom step type. One of the features is showing some step's data in the description field.

But some data are in an array of dynamic size.

Is there a way to iterate through the arrays in the expression field ?

This question is not limited to Step Description Expression. You can use it in every Expression.

Regards

Juergen

[Scott_Richardson]

Juergen -

The expression language does not have "for loop" iterator syntax, so the only option that you have is to process the step description string as in the post-step and store it in a step property during run-time. If you want to display the data in the array in a simple list, then you could use Str to format all the elements of the array, for example the folloiwng expression:

    Str({1,2,3,4}, "%d", 1, False, " - ")

would output

1 - 2 - 3 - 4

[j_dodek · Accepted solution]

Hi Scott,

Thanks for the anwser.  

For the iteration, i have switched back to an old solution which used the Evaluate().

http://forums.ni.com/t5/NI-TestStand/Loop-in-a-Pre-Expression/m-p/838888

Regards

Juergen

[Scott_Richardson]

That's pretty cool, I had not seen anyone suggest that before. Thanks.