[js] - 핸드폰 번호 가리기

문제

function solution(phone_number) {
    phone_number = Array.from(phone_number);
    let answer = [];
    
    for(let i=0; i<phone_number.length-4; i++){
        answer.push('*');
     }
  
    for(let i=phone_number.length-4; i<phone_number.length; i++){
        answer.push(phone_number[i]);
    }
    
    answer = answer.join('');
    
     return answer;

}



// function hide_numbers(s){
//     var result = "*".repeat(s.length - 4) + s.slice(-4);
//     return result;
//   }