Sheetworker confusion

I have been altering a sheet for my own use for some time now, and I finally got around to thinking about sheet workers.  I don't have a lot of things I would like to automate, and most of them are really simple mathematically.  However, I just can't seem to wrap my head around the sheetworker examples on the wiki. As an example, I would like to take the Physical Strength stat, multiply that stat by 20, and have the result entered as Lift.  I have been fiddling with the universal sheetworker code from the wiki.  The attribute for Physical Strength is "ps", and the attribute for Lift is "lift". on("change:ps sheet:opened", function () { getAttrs(['ps'], function (values) { const ps = parseInt(values['ps'], 10)||0; // this extracts the stat, and assumes a stat score of 0 the stat is not recognised as a number. const modifier = Math.(ps*20); setAttrs({ lift: modifier }); }); }); But that doesn't seem to be working for me.  I expect I am missing something really simple, but have no idea what it may be.  Help?

Okay I'm not good at this, but I can point out that there exist now two more pages that details how sheetworkers can work , apart form the main page. I've also linked these newer pages made by GiGs at the bottom of the main sheetworker page.

Yeah, I have looked those over.  From one of those examples, I tried: on("change:ps sheet:opened", function () { getAttrs(['ps'], function (values) { setAttrs({ lift: math.(values.ps*20) }); }); }); It doesn't seem to work either.  I expect I am just not understanding something that is really simple, and I will feel foolish once I do.

Your math statement isn't correct syntax. You dont need to use Math. for simple arithmetic, it's only used for specific functions like Math.floor. on("change:ps sheet:opened", function () { getAttrs(['ps'], function (values) { const ps = parseInt(values['ps'], 10)||0; const modifier = ps*20; setAttrs({ lift: modifier }); }); }); If your input is of type number, you can make this a lot simpler. on("change:ps sheet:opened", function () { getAttrs(['ps'], function (values) { setAttrs({ lift: values.ps * 20 }); }); }); I always include the const statements in my examples, because that structure is easier to debug when you have a problem. If the second version doesnt work, try the first. The second version will fail if the input/attribute 'ps' ever has a non-numerical value (possibly including being empty).

Thanks!  I did end up using the first version, and had the Math in there for a couple things I decided to do later.  I have now have 7 little boxes happily filling themselves in based on other manually filled boxes.