How to add user-defined functions in code.gs in the Google Script Manager

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I'm trying to add my own functions to a Google Apps script attached to a spreadsheet but I keep getting the error "Missing formal parameter". My fundamental problem is that I don't understand how the different functions and .gs files in the Script Manager interact...

In the Script Manager, I've already modified Code.gs and it does what I intended. I'm now trying to add a second function to Code.gs:

function sliceCol(2darray, col){
   var column = [];
   for(var i=0; i<2darray.length; i++){
     column.push(2darray[i][col]);
   }

   return column;
}

"2darray" and "col" are not defined elsewhere and are placeholders for the 2darray and integer that I want to pass to this function.

Can someone please help me understand how to do this?

Many Thanks.

asked 31 secs ago

Iesen

1