Are those two fields need to transfer the position? rItem and lItem. jinqjs line544

[Jackclarify]

https://github.com/fordth/jinqJs/blob/4fc27afe17184961ec43616d0740056ea4043e8e/jinqjs.js#L544 Are those two fields need to transfer the places? rItem and lItem. Here is a simple example

let items = [ { 'id': '8936b02f-e18c-4627-96e2-c61a568d98ac',
    'response': '' }];
let answers = [{"comment":"0000","id":"8936b02f-e18c-4627-96e2-c61a568d98ac","value":0}];
let ddd = new jinq().from(items).leftJoin(answers).on('id').select(question => {
                return {
                    id: question.id,
                    response: question.value,
                    comment: question.comment,
                    responseTime: question.currentTime
                };
            });

console.dir(ddd);
// [ { id: '8936b02f-e18c-4627-96e2-c61a568d98ac',
//     response: 0,
//     comment: '0000',
//     responseTime: undefined } ]

let items2 = [ { 'id': '8936b02f-e18c-4627-96e2-c61a568d98ac',
    'response': '',
    'comment': '3333' }];
let ddd2 = new jinq().from(items2).leftJoin(answers).on('id').select(question => {
                return {
                    id: question.id,
                    response: question.value,
                    comment: question.comment,
                    responseTime: question.currentTime
                };
            });

console.dir(ddd2);
// [ { id: '8936b02f-e18c-4627-96e2-c61a568d98ac',
//     response: 0,
//     comment: '3333',   //  <== here not changed
//     responseTime: undefined } ]

// expect result: 
// [ { id: '8936b02f-e18c-4627-96e2-c61a568d98ac',
//     response: 0,
//     comment: '0000',   //  <== expect change here
//     responseTime: undefined } ]

mergeObjectsFields method details:

        mergeObjectsFields = function (objects) {
            var obj = {};

            for (var index = 0; index < objects.length; index++) {
                for (var prop in objects[index]) {
                    obj[prop] = objects[index][prop];
                }
            }
            console.dir(obj);
            console.dir('_______________  finally _________________________');
            return obj;
        },

item change process: rItem:

{ comment: '0000',
  id: '8936b02f-e18c-4627-96e2-c61a568d98ac',
  value: 0 }

lItem: { id: '8936b02f-e18c-4627-96e2-c61a568d98ac', response: '' } mergeObjectsFields([rItem, lItem]): // <== line 544;

{ comment: '0000', // <== mergeObjectsFields method response
  id: '8936b02f-e18c-4627-96e2-c61a568d98ac',
  value: 0,
  response: '' }

item2 change process: rItem:

{ comment: '0000',
  id: '8936b02f-e18c-4627-96e2-c61a568d98ac',
  value: 0 }

lItem:

{ id: '8936b02f-e18c-4627-96e2-c61a568d98ac',
  response: '',
  comment: '3333' }

mergeObjectsFields([rItem, lItem]): // <== line 544;

{ comment: '3333',   // <== mergeObjectsFields method response
  id: '8936b02f-e18c-4627-96e2-c61a568d98ac',
  value: 0,
  response: '' }

@fordth Could you please help me or any one explain this? Thanks.