In order to debug your web apps from iOS device follow the steps:
Connect your device with your mac and make sure to tap on Trust when prompted.

Turn on the web inspector
On your iOS device goto Settings → Scroll down to Safari
On the bottom Goto Advanced → Turn on the Web Inspector
Let say you have a product which contains bunch of variants and you want to show the starting price of each product in your app. Let say the product and variant model looks like this:
Next, create an extension for the product class and define a function like this:
You can call this function from the instance of your product. That’s it :)