The Connect SDK page claims "nRF Connect SDK is IDE agnostic, which means you can use your own IDE if you prefer." Having downloaded it, though, I can find no option to open an example project in the IAR IDE, make sure my target has a matching SoftDevice, compile, and run. I find myself in a spiral of nRF Connect Desktop wants me to install Toolchain Manager which wants me to install nRF Connect SDK which only has an option to start VSCode which says I need to install multiple other packages ... at which point I gave up.
This sort of thing is available in SDK 17.1.0. Although that's marked as being "in maintenance mode", I could download it, unzip it, open one of the many code samples, compile it*, and run it.
TL;DR - where are the IAR IDE examples for nRF Connect SDK?
*OK, compile it after fixing a couple of obvious errors