$(function(){

  'use strict';

  let card_data = [];

  // plus
  let max_i_2 = 9;

  for ( let i_1 = 10 ; i_1 <= 18 ; i_1++ ) {

    for ( let i_2 = 1 ; i_2 <= max_i_2 ; i_2++ ) {

      card_data.push({
        front: [ i_1, i_2 ], 
        back: i_1 + i_2,
        symbol: 'plus'
      });
    }

    max_i_2--;
  }

  // minus
  max_i_2 = 9;

  for ( let i_1 = 19 ; i_1 >= 11 ; i_1-- ) {

    for ( let i_2 = 1 ; i_2 <= max_i_2 ; i_2++ ) {

      card_data.push({
        front: [ i_1, i_2 ], 
        back: i_1 - i_2,
        symbol: 'minus'
      });
    }

    max_i_2--;
  }


  let card = new CalcCard({
    card_data : card_data,
    order_type : 'random'
  });

  let control = new CalcControl(card);

  control.changeOrder('random');

});