project-lvl1-s132/dist/games/progression.js

Brain Games

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _start = require('../start');

var _start2 = _interopRequireDefault(_start);

var _lib = require('../lib');

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

var rulesMessage = 'What number is missing in this progression?';

var progressionLength = 10;
var limitStartPosition = 100;
var limitDiff = 10;
var maskSymbol = '..';

var getProgression = function getProgression(diff) {
  var startValue = (0, _lib.getRandomInt)(limitStartPosition);
  var output = [startValue];
  for (var i = 1; i < progressionLength; i += 1) {
    output.push(output[i - 1] + diff);
  }

  return output;
};

var getQuestionAnswerPair = function getQuestionAnswerPair() {
  // get question
  var diff = (0, _lib.getRandomInt)(limitDiff);
  diff = diff === 0 ? 1 : diff;
  var questionResult = getProgression(diff);
  var mask = (0, _lib.getRandomInt)(progressionLength);
  questionResult[mask] = maskSymbol;

  var question = questionResult.join(' ');

  // get correctAnswer
  var answerDigit = questionResult.map(function (val) {
    var res = val === maskSymbol ? val : +val;
    return res;
  });

  var index = answerDigit.indexOf(maskSymbol);
  var result = void 0;
  if (index === 0) {
    result = answerDigit[1] - diff;
  } else {
    result = answerDigit[index - 1] + diff;
  }

  var correctAnswer = result.toString();

  return { question: question, correctAnswer: correctAnswer };
};

exports.default = function () {
  return (0, _start2.default)(rulesMessage, getQuestionAnswerPair);
};
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