For example
”Please create a viewer for geojson where i can select individual feature polygons and then have button ’export’ that exports the selected features to a new geojson”
1. You run it 2. It shows the json and visualizes selections 3. The exported subset looks good
I have no idea how anyone could keep the callgraph of even a minimal gui application in their head. If you can then congratulations, not all of us can!