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util/array.lua @ 918:967edf874df7
util.array: New array library
author | Matthew Wild <mwild1@gmail.com> |
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date | Wed, 25 Mar 2009 03:00:09 +0000 |
child | 920:e302cbc9d036 |
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local array_methods = {}; local array_mt = { __index = array_methods, __tostring = function (array) return array:concat(", "); end }; local function array(t) return setmetatable(t or {}, array_mt); end function array_methods: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_methods: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_methods.push = table.insert; array_methods.pop = table.remove; array_methods.sort = table.sort; array_methods.concat = table.concat; array_methods.length = function (t) return #t; end function array_methods:random() return self[math.random(1,#self)]; end function array_methods: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 _G.array = array