javascript iterate through and map a multi-dimensional array -

i want apply function each of values @ levels of array:

arr = [[1,2,3],[1,2,3],[[1,2],[1,2]],1,2,3] 

for example, multiply values 3, , map in same format before get:

arr = [[3,6,9],[3,6,9],[[3,6],[3,6]],3,6,9] 

what best way go this?

i tried use recursive function:

function mapall(array){          array.map(function(obj){                    if (array.isarray(obj)===true) { return mapall(obj) }                    else{ return obj*3 }                    })             }; 

but when run undefined, must doing not quite right??

any ideas??

thanks

everything working, forgot return array.map. here's cleaner version of code:

var arr = [[1,2,3],[1,2,3],[[1,2],[1,2]],1,2,3];  function mapall(array){    return array.map(function(item){      return array.isarray(item) ? mapall(item) : item * 3;    });  }  alert(json.stringify(mapall(arr)));