Javascript remove last item in stack trace string

Question

I am creating a Javascript logger, in which, on error messages, I am also adding the stack trace like this:

function logMessage(logMessage) 
{
  let stackTrace = new Error().stack;
  logMessage.stackTrace = stackTrace;
  ...
}

This gives me the stack trace, but it also obviously adds the method of logMessage itself as the last item on the stack...

How can I remove the last trace so I'll only see the trace up until the point that the logMessage was called, but without the logMessage itself?

Answer 1

The way to do it is really simple since the stack we are getting is a string divided by \n, in this format:

ERROR \n
at ... \n
at ... \n

so all we need to do is:

let stackTrace = new Error().stack;   //get the stack trace string
let arr = stackTrace.split("\n");     //create an array with all lines
arr.splice(1,1);                      //remove the second line (first line after "ERROR")
stackTrace = arr.join("\n");          //join array back to a string