This is a limited example, so “const” is used.

The code is as follows:

const bobsFollowers = ['James', 'Andy', 'John', 'Jeremy'];

const tinasFollowers = ['Andrew', 'Andy', 'Jeremy']; // Both are limited e.g.s

const mutualFollowers = []; // To be printed after code runs.

for (let i = 0; i < bobsFollowers.length; i++) {
  for (let j = 0; j < tinasFollowers.length; j++) {
    if (bobsFollowers[i] === tinasFollowers[j]) {
      mutualFollowers.push(tinasFollowers[j]); // Push used to edit array.
    }
  }
}

console.log(mutualFollowers);

Still part of the Codecademy JS course.