중첩 for 문 예시

let bobsFollowers = ['Joe', 'Marta', 'Sam', 'Erin'];

let tinasFollowers = ['Sam', 'Marta', 'Elle'];

let mutualFollowers = [];

 

for (let i = 0; i < bobsFollowers.length; i++) {

  for (let j = 0; j < tinasFollowers.length; j++) {

    if (bobsFollowers[i] === tinasFollowers[j]) {

      mutualFollowers.push(bobsFollowers[i]);

    }

  }

};

 

console.log(mutualFollowers);