+function array_base.reverse(outa, ina)
+ local len = #ina;
+ if ina == outa then
+ local middle = math_floor(len/2);
+ len = len + 1;
+ local o; -- opposite
+ for i = 1, middle do
+ o = len - i;
+ outa[i], outa[o] = outa[o], outa[i];
+ end
+ else
+ local off = len + 1;
+ for i = 1, len do
+ outa[i] = ina[off - i];
+ end
+ end
+ return outa;
+end
+