React Javascript Promise call says cannot read property ‘then of undefined (looks valid )

I don’t know if it is React.JS , or just me forgetting something with promises but I’m getting this error const promise = SAIIndexedDB(response.data) promise.then(function(result){ this.setState({ loadingMedications: false }); }) .catch(function(error){ console.log(‘error’, error); }); Error: TypeError: Cannot read property ‘then’ of undefined line number shows it is this line promise.then(function(result){ I was reading through this…

What are the benefits and disadvantages of having different JavaScript engines?

Currently, there are different JavaScript engines maintained by Google, Mozilla, and Apple. We have recently seen many browsers adopt V8, which is Chrome’s JavaScript engine — Brave, Opera, and Edge browsers. My question is, why are there so many browser battles? Wouldn’t it be better to have one universal JavaScript engine as opposed to different…

JavaScript/Dynamics CRM: Need help finishing JavaScript event that counts how many records in a grid’s “Id & Qualify” field =”Yes”

In my Opportunity form, I’ve added a “Sales Quota Distribution” entity editable grid. One Opportunity can have many Sales Quota Distribution records. I am working on a JavaScript event that counts how many records = “Yes” in the “ID & Qualify” field for records shown in the Sales Quota Distrubution grid. “ID & Qualify” is…