[Javascript] 배열 뒤집기

1. FOR

function reverse(num_list) {
    var answer = [];
    var j = num_list.length
    for(var i = 1; i <= j; i++){
        answer.push(num_list[j-i])
    }
    console.log(answer);
    return answer;
}

var list = [7,3,5,4,2];
reverse(list);

 

2. Reverse()

var list = [7,3,2,5,9];
list.reverse();

console.log(list);

 

3. Reverse() 사용 + 전개 연산자 (Spread operator)

var list = [7,3,9,5,2];
var reverse = [...list].reverse(); // "..." 사용

console.log(reverse);