/* Loops/Nested in Jsish */
Math.srand(0);
var nrows = Math.floor(Math.random() * 4) + 4;
var ncols = Math.floor(Math.random() * 6) + 6;

var matrix = new Array(nrows).fill(0).map(function(v, i, a):array { return new Array(ncols).fill(0); } );

var i,j;
for (i = 0; i < nrows; i++) for (j = 0; j < ncols; j++) matrix[i][j] = Math.floor(Math.random() * 20) + 1;

/* Labelled break point */
outer_loop:
for (i in matrix) {
    printf("row %d:", i);
    for (j in matrix[i]) {
        printf(" %d", matrix[i][j]);
        if (matrix[i][j] == 20) {
            printf("\n");
            break outer_loop;
        }
    }
    printf("\n");
}
puts(matrix);

/*
=!EXPECTSTART!=
row 0: 2 18 12 16 14 8 18 15 9 8
row 1: 15 6 8 16 17 12 15 2 10 3
row 2: 11 8 12 20
[ [ 2, 18, 12, 16, 14, 8, 18, 15, 9, 8 ],
  [ 15, 6, 8, 16, 17, 12, 15, 2, 10, 3 ],
  [ 11, 8, 12, 20, 18, 4, 6, 6, 19, 9 ],
  [ 16, 3, 2, 19, 1, 4, 8, 4, 11, 18 ] ]
=!EXPECTEND!=
*/