2020 카카오 인턴십) 키패드 누르기

https://school.programmers.co.kr/learn/courses/30/lessons/67256?language=javascript 

프로그래머스

function solution(numbers, hand) {
  let answer = "";
  let lp = "*";
  let rp = "#";
  const keyPad = [
    [3, 1],
    [0, 0],
    [0, 1],
    [0, 2],
    [1, 0],
    [1, 1],
    [1, 2],
    [2, 0],
    [2, 1],
    [2, 2],
  ];
  function dis(a, b) {
    if (!isNaN(b)) {
      return (
        Math.abs(keyPad[a][0] - keyPad[b][0]) +
        Math.abs(keyPad[a][1] - keyPad[b][1])
      );
    } else {
      if (b === "*") {
        return Math.abs(keyPad[a][0] - 3) + Math.abs(keyPad[a][1]);
      } else {
        return Math.abs(keyPad[a][0] - 3) + Math.abs(keyPad[a][1] - 2);
      }
    }
  }
  function L(x) {
    lp = x;
    answer += "L";
  }
  function R(x) {
    rp = x;
    answer += "R";
  }
  for (let x of numbers) {
    if (x === 1 || x === 4 || x === 7) L(x);
    else if (x === 3 || x === 6 || x === 9) R(x);
    else {
      if (dis(x, rp) < dis(x, lp)) R(x);
      else if (dis(x, rp) > dis(x, lp)) L(x);
      else {
        if (hand === "right") R(x);
        else L(x);
      }
    }
  }
  return answer;
}