this code is only iterating the first 9 nos in the nested array.
var arr = [[[1,2,3,4,5,6,7,8,9],[1,2,3,4]]];
for (var i=0; i < arr.length; i++) {
for(var j = 0; j < arr[i].length; j++) {
for(var k = 0; k < arr[j].length; k++){
console.log(arr[i][j][k]);
};
};
};
arr[i][j].lengthfor-loopfor you ?