printTreehouseSummary() function has incorrect template literal for courses

I was confused about why I was getting different output based on the value of a template literal on Line 45 of the work-space code:

console.log(`Treehouse has ${i} JavaScript courses, and ${teachers.length} Javascript teachers`);

When running my code with the ${i} template literal for "courses", I get a 6 for the output before calling the addNewTeachers function. After calling it, I'm then getting a 1. I figured out it's due to the way my function works and the scope of the for loop's counter variable, which I mistakenly made i. It was basically adding 2 people and making the "index" variable 1.

function addNewTeachers(newTeachers) {
  // TODO: write a function that adds new teachers to the teachers array
  // DONE
  for (i in newTeachers) {
    let teacherToAdd = newTeachers[i];
    teachers.push(teacherToAdd);
  }
}

The best fix I could come up with is removing the i variable and changing the template literal for courses to ${courses.length}. Ideally i should only be used inside of a loop for obvious reasons having to do with scope.

Just thought I would share this in case anyone else runs into the same problem. If anyone else has other ways they wrote the addNewTeachers function, let me know. Thanks!