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This is a more practical example. With sway you can move windows to a "scratchpad", i.e. like iconify it. There may be an official way to get back such windows, but I didn't find a good one. There's the "scratchpad show" command, but it doesn't allow you to select a window, it just shows the next one (and it keeps it in the floating state).
So, this example program lists all windows currently garaged on the scratchpad. When called with a windows id, it gets back the window to the current workspace and gives it focus - thus descratching it.
To add comfort to the process I added a small script which you can use as a ui to it. It uses rofi which makes a handy ui. To use it, compile descratch with "go build", copy the descratch binary to some location within your $PATH and run the script.