I posed that as a question on the final in an Icon class I taught this past
semester.
Several students found a more concise solution but here's what I put forth
as a solution:
procedure urlfromhex(s)
s ? {
r := ""
while r ||:= tab(upto('%')) do {
move(1)
code := integer("16r"||move(2)) | fail
r ||:= char(code)
}
return r || tab(0)
}
end
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