[JS] 백준 1157번 / 단어 공부 / 심화 1

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문제

1157번: 단어 공부

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정답

let fs = require("fs");
let filePath = process.platform === "linux" ? "/dev/stdin" : "test.txt";

let input = fs
  .readFileSync(filePath)
  .toString()
  .trim()
  .split("")
  .map(x => x.toUpperCase());
let obj = {};

input.map(x => {
  obj[x] === undefined ? (obj[x] = 1) : obj[x]++;
});

let values = Object.values(obj);
let answer = values.filter(x => x === Math.max(...values));

answer.length > 1 ? console.log("?") : console.log(Object.keys(obj).find(x => obj[x] === Math.max(...values)));

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