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Sorting with a user defined routine
Tables and the table library. example from a Well House Consultants training course
More on Tables and the table library. [link]
Source code: cleversort Module: U105
--[[
Sorting with a user defined routine - the routine return a true (a < b) or false (otherwise) when asked to compare two incoming values - and the built in sort routine does the rest of the clever stuff ]] function postman (dis, dat) -- This goes down the even numbers -- then back up the odd ones! -- print (dis,dat) -- Educational! -- Different sides of road! if math.mod(dis,2) == 0 and math.mod(dat,2) ~= 0 then return true end if math.mod(dat,2) == 0 and math.mod(dis,2) ~= 0 then return false end -- Same side of road -- count up if math.mod(dat,2) == 0 then if dis > dat then return true end return false -- or count down for the other side else if dis < dat then return true end return false end end stuff = {4,15,27,40,39,62,21, 19,28} table.sort(stuff,postman) for i,val in ipairs(stuff) do print (val) end for x,y in pairs(_G) do print (x,y) end Learn about this subject
This module and example are covered on the following public courses:
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