miso_coding_test_1.js

const readline = require("readline");

const r = readline.createInterface({
  input: process.stdin,
  output: process.stdout
});

class Converter {
  static ARGS_SIZE = 2;
  static NUMBER_CHART = {
    "0": 0,
    "1": 1,
    "2": 2,
    "3": 3,
    "4": 4,
    "5": 5,
    "6": 6,
    "7": 7,
    "8": 8,
    "9": 9
  };
  static stringToNumber(str) {
    return str.split("").reduceRight((acc, cur, index) => {
      return acc + Converter.NUMBER_CHART[cur] * 10 ** (str.length - 1 - index);
    }, 0);
  }

  _args = [];
  getSize() {
    return this.args.length;
  }
  get args() {
    return this._args;
  }
  set args(args) {
    if (!Array.isArray(args)) {
      throw Error("args is wrong format");
    }
    if (args.length > Converter.ARGS_SIZE) {
      throw Error("arges length is over 2");
    }
    this._args = args;
  }
  appendArg(arg) {
    this.args = [...this.args, arg];
  }
  calculate() {
    return this.args.reduce((sum, n) => sum + Converter.stringToNumber(n), 0);
  }
}

r.prompt();

const converter = new Converter();

r.on("line", arg => {
  converter.appendArg(arg);
  if (converter.getSize() === Converter.ARGS_SIZE) {
    console.log(`Your Input is : ${converter.args}\
        result : ${converter.calculate()}`);
    r.close();
  } else {
    console.log(`need more ${Converter.ARGS_SIZE - converter.getSize()} arg`);
  }
  r.prompt();
});

r.on("close", () => {
  process.exit();
});