LV0 :: 2의 영역

https://school.programmers.co.kr/learn/courses/30/lessons/181894

프로그래머스

function solution(arr) {
    var array = [];
    let answer = [];
    
    for(i=0; i<arr.length; i++){
        if(arr[i]==2){
            array.push(i);
        }
    } 
    
    if(array.length==0){
        answer.push(-1);
    }
    else {
        for(i=array[0]; i<=array[array.length-1]; i++){
            answer.push(arr[i]);
        }
    }
    
    return answer;
}