scala - Fill immutable map with for loop upon creation -

i have map looks this:

val fields: map[(int, int), field] 

and thought doing like:

val fields: map[(int, int), field] =  map(    for(a <- 0 10)    {      (0, a) -> new field(this, 0, a)    } ) 

instead of long copy/paste list like:

  (0, 0) -> new field(this, 0, 0),   (1, 0) -> new field(this, 1, 0),   (2, 0) -> new field(this, 2, 0),   (3, 0) -> new field(this, 3, 0),   (4, 0) -> new field(this, 4, 0),   (5, 0) -> new field(this, 5, 0),   (6, 0) -> new field(this, 6, 0),   (7, 0) -> new field(this, 7, 0),   (8, 0) -> new field(this, 8, 0),    (0, 1) -> new field(this, 0, 1), ... 

but

type mismatch, expected: (notinfereda, notinferedb), actual: unit

why , how can overcome this?

the problem comprehension doesn't return anything. here 2 different solutions problem. prefer second one.

case class field(map: map[(int, int), field], a: int, b: int)  val fields: map[(int, int), field] =  map(    (for(a <- 0 10) yield (0, a) -> new field(fields, 0, a)): _* )  val fields: map[(int, int), field] =   (0 10).map(a => (0, a) -> new field(fields, 0, a)).tomap 

edit:

case class field(board: board, x: int, y: int) class board {   val fields: map[(int, int), field] =     (0 10).map(a => (0, a) -> new field(this, 0, a)).tomap } 

 

class board {   val fields: map[(int, int), field] =     (for(a <- 0 10; b <- 0 10)         yield (a, b) -> new field(this, a, b)).tomap }