check, that a script is in a folder

[S Mathias]

$ echo ${PWD##*/}
somefolder
$ if "${PWD##*/}" -eq "asdf" > /dev/null; then echo "this is the asdf folder"; else exit 1; fi
bash: notthatfolder: command not found...
this is the asdf folder
$ 


So i just want to check that i'm in an exact folder. e.g.: "asdf"

What's wrong with my one-liner?

I just want to check, that a script is in a folder, and if it isn't, then it exits