list-onearg
list-onearg outputs its first creation argument when it receives a bang, but produces no output if that argument is blank. It accepts any kind of argument, and a second creation argument can be supplied as a default when the first is blank.
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Pdand go toToolsFind Externals. Search forlist-absand install it. Then create an object withdeclare -lib list-abs -path list-abs. Finally, uselist-oneargor any other object fromlist-abs.