DART

2d list in dart

 //Declare and initialize a matrix x having 
 //m rows and n columns, containing real numbers.

var x = new List.generate(m, (_) => new List(n));

multi-dimensional list in dart

int a = 3;
int b = 3;

var tList = List.generate(a, (i) => List(b), growable: false);
print(tList); 
// [[null, null, null], [null, null, null], [null, null, null]]