07 - Array Cardio Day 2 (Javascript 30)

javascript의 array에 대해서 배우는 시간 2편입니다.

여기서는 some, every, find, findindex에 대해서 공부를하게 됩니다.

 

1. is at least one person 19 or older? (한 사람 이상이 19세 이상인가?)

const isAdult = people.some(person => ((new Date().getFullYear()) - person.year) >= 19);
console.log(isAdult);

2. is everyone 19 or older? (모두가 19세 이상인가?)

const allAdult = people.every(person => ((new Date().getFullYear()) - person.year) >= 19);
console.log(allAdult);

 

3. Find is like filter, but instead returns just the one you are looking for find the comment with the ID of 823423

(댓글 중 id가 823423인것 찾기)

const comment = comments.find(comment => comment.id === 823423);
console.table(comment);

 

4. Find the comment with this ID delete the comment with the ID of 823423 (댓글 중 id가 823423인것 삭제)

const index = comments.findIndex(comment => comment.id === 823423);
const newComments = [
  ...comments.slice(0, index),
  ...comments.slice(index + 1)
];

console.table(newComments);