Wed, 25 Mar 2009 03:00:09 +0000
util.array: New array library
918 | 1 | local array_methods = {}; |
2 | local array_mt = { __index = array_methods, __tostring = function (array) return array:concat(", "); end }; | |
3 | ||
4 | local function array(t) | |
5 | return setmetatable(t or {}, array_mt); | |
6 | end | |
7 | ||
8 | function array_methods:map(func, t2) | |
9 | local t2 = t2 or array{}; | |
10 | for k,v in ipairs(self) do | |
11 | t2[k] = func(v); | |
12 | end | |
13 | return t2; | |
14 | end | |
15 | ||
16 | function array_methods:filter(func, t2) | |
17 | local t2 = t2 or array{}; | |
18 | for k,v in ipairs(self) do | |
19 | if func(v) then | |
20 | t2:push(v); | |
21 | end | |
22 | end | |
23 | return t2; | |
24 | end | |
25 | ||
26 | ||
27 | array_methods.push = table.insert; | |
28 | array_methods.pop = table.remove; | |
29 | array_methods.sort = table.sort; | |
30 | array_methods.concat = table.concat; | |
31 | array_methods.length = function (t) return #t; end | |
32 | ||
33 | function array_methods:random() | |
34 | return self[math.random(1,#self)]; | |
35 | end | |
36 | ||
37 | function array_methods:shuffle() | |
38 | local len = #self; | |
39 | for i=1,#self do | |
40 | local r = math.random(i,len); | |
41 | self[i], self[r] = self[r], self[i]; | |
42 | end | |
43 | end | |
44 | ||
45 | _G.array = array |