This question might be a bit of an overstretch, or really obvious, but I haven't been able to find an answer yet.

Is there a way to automatically view the minimum required arguments for a WL function? For example, Sin only requires 1 argument, while Replace requires both an expression and the list of rules. Is there a way that, for example, I can input Sin into a function, and get back something like {Real}, or enter Replace, and get back {Expression, Rules}?

I hope this makes sense - I would like to be able to automate input to any function in Mathematica, by being given the required arguments.


  • 4
    $\begingroup$ Is there a way to automatically view the minimum You might be able to parse it out from the output of Information[functionName], It will list all the different signatures of the function there, one per line. $\endgroup$
    – Nasser
    Sep 11, 2018 at 21:31
  • $\begingroup$ That's a good idea, however, when I try val = Information[Replace], and then view the results with ?val, it returns that val = Null $\endgroup$
    – Jmeeks29ig
    Sep 11, 2018 at 21:55
  • 2
    $\begingroup$ @Jmeeks29ig Information has side effects and doesn't return anything. Fortunately we can scrape the side effects with Block[{CellPrint = Sow}, Reap[Information[Replace]][[-1, 1]]]. However Replace::usage would be an easier way to see the information your after. $\endgroup$
    – Greg Hurst
    Sep 12, 2018 at 12:47
  • $\begingroup$ Great, thanks! I hadn't known that was possible $\endgroup$
    – Jmeeks29ig
    Sep 12, 2018 at 19:56

1 Answer 1


You can use SyntaxInformation:

SyntaxInformation /@ {Sin, Replace} // Column

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  • $\begingroup$ It works - thanks!!! $\endgroup$
    – Jmeeks29ig
    Sep 11, 2018 at 22:48
  • 1
    $\begingroup$ @Jmeeks29ig, you are most welcome. $\endgroup$
    – kglr
    Sep 11, 2018 at 22:56

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