Sort the letters of string in alphabetical order: Difference between revisions

Concise version, implicit rather than explicit collation sequence table, adequate for this use, same output:

<lang lua>function sort(s) -- Latin letters lexicographically, uppercase first, anything else by ASCII

local sl,t=string.lower,{} s:gsub("(%S)", function(c) t[#t+1]=c end) -- use "(.)" as pattern to preserve whitespace

table.sort(t, function(a,b) return sl(a)==sl(b) and a<b or sl(a)<sl(b) end) -- implicitly

return table.concat(t)

end

print(sort("Now is the time for all good men to come to the aid of their country."))</lang>