helpers.js

// *******************  Scroll to element's position
//get parameters are iteration of all objects selected by .selection
$(".selection").get(0).scrollIntoView();

// *******************  Check if checkbox is checked
$(".checkbox").on("change", function () {
  if ($(this).is(":checked")) {
    doSomething();
  } else {
    doSomething();
  }
});

// *******************  Check checkbox
$(".checkbox").prop('checked', true);

// *******************  Check radio or checkbox depending on value from backend (user.gender = value - "M")
$('input[name="gender"]').filter('[value=' + user.gender + ']').prop("checked", true);

/**
 *  Group array by key
 * @param {array} xs array to group
 * @param {string} key string of key to group by
 * @returns {Object}
 */

var groupBy = function (xs, key) {
  return xs.reduce(function (rv, x) {
    (rv[x[key]] = rv[x[key]] || []).push(x);
    return rv;
  }, {});
};