Upgrades.js Explanation

I'm hoping someone won't mind casting a quick eye over the below to check it will do what I think it will do? The explanation for upgrades.js aren't very thorough...

for major version 1 minor 12, I need to:

1. for each question (parameters.categoriesList.questionList) I need to add an image field, and a textAnswerPoints field,

2. If questionType is multipleChoice, add a multipleChoicePoints field to each of the alternative answers.

3. Add a back button enabled boolean field to each category.

Will this code do that?

var H5PUpgrades = H5PUpgrades || {};
 
H5PUpgrades['H5P.FTAQuestionnaire'] = (function () {
  return {
    1: {
      12: function (parameters, finished) {
        if (parameters && parameters.categoriesList) {
          parameters.categoriesList.forEach(function (category) {
            if (category.questionList !== undefined) {
              category.questionList.forEach(function (question) {
                if (question.textAnswerPoints === undefined) {
                  question.textAnswerPoints = 0;
                }
                if (question.image === undefined) {
                  question.image = {};
                }
                question.image.path = '';
                question.image.width = 0;
                question.image.mime = '';
                question.image.height = 0;
                question.image.copyright = {};
                question.image.copyright.licence = '';
                if (question.questionType === 'multipleChoice' ) {
                  question.multipleChoiceInputGroup.alternatives.multipleChoicePoints = 0;
                }
              });
              if (category.disableBackButton === undefined) {
                category.disableBackButton = false;
              }
              
            }
          });
        }
        finished(null, parameters);
      }
    }
  };
})(H5P.jQuery);