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util/array.lua @ 1179:503d68e7e18a
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author | Matthew Wild <mwild1@gmail.com> |
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date | Sat, 16 May 2009 20:48:07 +0100 |
parent | 1027:fe2e3d3dba6a |
child | 1371:9e45bdf55353 |
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local array = {}; local array_mt = { __index = array, __tostring = function (array) return array:concat(", "); end }; local function new_array(_, t) return setmetatable(t or {}, array_mt); end setmetatable(array, { __call = new_array }); function array:map(func, t2) local t2 = t2 or array{}; for k,v in ipairs(self) do t2[k] = func(v); end return t2; end function array:filter(func, t2) local t2 = t2 or array{}; for k,v in ipairs(self) do if func(v) then t2:push(v); end end return t2; end array.push = table.insert; array.pop = table.remove; array.sort = table.sort; array.concat = table.concat; array.length = function (t) return #t; end function array:random() return self[math.random(1,#self)]; end function array:shuffle() local len = #self; for i=1,#self do local r = math.random(i,len); self[i], self[r] = self[r], self[i]; end end function array:reverse() local len = #self-1; for i=len,1,-1 do self:push(self[i]); self:pop(i); end end function array.collect(f, s, var) local t, var = {}; while true do var = f(s, var); if var == nil then break; end table.insert(t, var); end return setmetatable(t, array_mt); end _G.array = array; module("array"); return array;