io02.js

var lines = [];
var reader = require('readline').createInterface(process.stdin, process.stdout);

var log = function(x) {
  console.log(x);
};

var questionInfo = {
  questions : [
    '1) 1 + 4 = 7',
    '2) 8 - 2 = 5',
    '3) 4 * 4 = 16',
    '4) 24 / 6 = 3'
  ],
  rightAnswer : '3'
}


var makeQuestion = function(questions) {
  var askStr = '';
  for(var i = 0; i < questions.length; i++) {
    askStr += questions[i] + '\n'
  }
  askStr += '正解はどれ？\n';
  return askStr;
}; 

var ask = function() {
  return makeQuestion(questionInfo.questions);
};
var judge = function(isRight) {
  return isRight ? '正解！' : '不正解！';
};



reader.question(ask(), function(answer) {
  
  var isRight = answer === questionInfo.rightAnswer;
  log(judge(isRight));

  reader.close();
})