Slightly different solution. Is this valid?

/*

1)  Write the code for function addNewTeachers() found on line 35. This function should receive parameter newTeachers, defined on line 52, and add the new teachers to the treehouseTeachers variable. 

2)  Find function printTreehouseSummary(). There is something you need to fix in this function so the console.log() on the final line of the function outputs the correct number of JavaScript courses and teachers.

3)  At this point, attempt to run your code by typing node let_const.js in your workspace console and hitting enter. You should receive an error message when you do this. Use the clues in this error message to fix the program so it runs.

*/


let teachers = [
    {
        name: 'Ashley',
        topicArea: 'Javascript'
    }
];

const newTeachers = [
    {
        name: 'James',
        topicArea: 'Javascript'
    },
    {
        name: 'Treasure',
        topicArea: 'Javascript'
    }
];

const courses = ['Introducing JavaScript',
                'JavaScript Basics',
                'JavaScript Loops, Arrays and Objects',
                'Getting Started with ES2015',
                'JavaScript and the DOM',
                'DOM Scripting By Example'];


const i = courses.length;


function addNewTeachers(newTeachers) {
    // TODO: write a function that adds new teachers to the teachers array 
  teachers = teachers.concat(newTeachers);
}


function printTreehouseSummary() {
    // TODO: fix this function so that it prints the correct number of courses and   teachers 

  for (let i = 0; i < teachers.length; i++) {
     console.log(`${teachers[i].name} teaches ${teachers[i].topicArea}`);
    }

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


addNewTeachers(newTeachers);
printTreehouseSummary();