# Need help on creating private chat **URL:** \ **Category:** Ask for Help\ **Created:** [June 11, 2020, 7:27pm UTC](https://community.glideapps.com/t/need-help-on-creating-private-chat/10686 "2020-06-11T19:27:18Z")\ **Posts on this page:** 1\ **Showing post:** 60
**Author:** ![ThinhDinh](https://sea2.discourse-cdn.com/flex002/user_avatar/community.glideapps.com/thinhdinh/32/49_2.png) [@ThinhDinh](https://community.glideapps.com/u/ThinhDinh)\ **Post date:** [June 29, 2020, 3:11pm UTC](https://community.glideapps.com/t/need-help-on-creating-private-chat/10686/60 "2020-06-29T15:11:13Z")
That’s why I mentioned the arrayformula so it automatically calculates when a new row (of topic) is added. I have written about the use of it here: > [@Tutorial: Arrayformula in Google Sheets, good practices & how to overcome Arrayformula restrictions with scripts](https://community.glideapps.com/t/tutorial-arrayformula-in-google-sheets-good-practices-how-to-overcome-arrayformula-restrictions-with-scripts/9727): > > Hi, Today I will show you the script that can make copying formulas down work, when it does not work with arrayformula. But first, let’s have some introductions about arrayformula, for those who has not used this before in Google Sheets, some equivalents in Glide and some good practices while using it. I hope it can help you in building your Glide apps as well as applying it in your normal day job. > > > **1/ Definition** > > > > Arrayformula is defined as “a range, mathematical expression using one cell range … If you need help with creating the arrayformula, feel free to tell me. --- _[View the full topic](https://community.glideapps.com/t/need-help-on-creating-private-chat/10686)._