tag function for formatting console.log(..) statements

1.js

function logger(strings,...values) {
   var str = "";
   for (let i = 0; i < strings.length; i++) {
      if (i > 0) {
         if (values[i-1] && typeof values[i-1] == "object") {
            if (values[i-1] instanceof Error) {
               if (values[i-1].stack) {
                  str += values[i-1].stack;
                  continue;
               }
            }
            else {
               try {
                  str += JSON.stringify(values[i-1]);
                  continue;
               }
               catch (err) {}
            }
         }
         str += values[i-1];
      }
      str += strings[i];
   }
   console.log(str);
   return str;
}

2.md

var v = 42;
var o = { a: 1, b: [2,3,4] };

logger`This is my value: ${v} and another: ${o}`;
// This is my value: 42 and another: {"a":1,"b":[2,3,4]}

try {
   nothing();
}
catch (err) {
   logger`Caught: ${err}`;
}
// Caught: ReferenceError: nothing is not defined
//    at <anonymous>:2:3