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multiple lists for foreach

I see code of this form:

foreach( (field prompt)
'( lib cell view resultfile )
list("Library Name" "Cell Name" "View Name" "Output Results File")

/*do something here*/

)

I understand that the loop is reading both "field" and "prompt" from the two lists, however, I do not find any documentation for this. This seems very similar to "zip" in python. What is this form called, and where is it documented.

Thanks

skillUser over 8 years ago

Hi,

This is just part of the allowable syntax for foreach (and other forms such as lambda) - you can have two variables iterated over two lists, three variables iterated over three lists and so on. In your particular example, in the first iteration field is set to 'lib and prompt is set to "Library Name", for the second iteration field is set to 'cell and prompt is set to "Cell Name"... I don't know 'zip' in Python so I can't comment.

Hopefully this helps,

Best regards,

Lawrence.
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Andrew Beckett over 8 years ago

It's also clearly documented in the SKILL Language Reference Manual. A search for "foreach" in cdnshelp finds this easily enough, and it's also in this chapter on the support portal: https://support.cadence.com/apex/techpubDocViewerPage?path=sklangref/sklangrefIC6.1.7/controlflow.html#1039950&title=%20foreach

It works because foreach is essentially a convenient way of calling mapc (one of several mapping functions) which apply a function of N arguments to N lists - essentially the foreach creates an anonymous function (a lambda) and then calls mapc. A number of ideas in python actually have been borrowed from Lisp (SKILL is a dialect of Lisp).

Regards,

Andrew.
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cadencename over 8 years ago

Thanks, as you said, this is documented in SKILL Language Reference. I was looking at SKILL Language User Guide, which does not have the detail.
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