Too many arguments when using tuples to assign array values via map

Question

I'm using a tuple within a map to help me assign values in an array, but I'm getting "too many arguments for method update"

val a = Map((1,1) -> "alex", (2,2) -> "Jade")
val boardRep = Array.ofDim[String](3, 3)
a foreach { 
  case (key, value) => {
    boardRep((key._1), (key._2)) = value
  }
}

This should come out to an array with "alex" in the (1,1) spot and "Jade" in the (2,2) spot. What am I doing incorrectly?

Xavier Guihot · Accepted Answer · 2018-05-06 21:55:35Z

1

In scala, creating an array of more than 1 dimension means creating Arrays inside Arrays:

scala> val boardRep = Array.ofDim[String](3, 3)
boardRep: Array[Array[String]] = Array(Array(null, null, null), Array(null, null, null), Array(null, null, null))

So to modify the cell (1, 1), you'll have to modify in cell 1 of the main array (boardRep(1): Array(null, null, null)), the cell 1 of this sub-array (boardRep(1)(1))

a foreach {
  case (key, value) =>
    // boardRep((key._1), (key._2)) = value
    boardRep(key._1)(key._2) = value
}

which then gives:

Array(Array(null, null, null), Array(null, alex, null), Array(null, null, Jade))

answered May 6, 2018 at 21:55

Xavier Guihot

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Comments

Andy Hayden · Accepted Answer · 2018-05-06 21:57:24Z

1

You can use arr(key1)(key2) to access into a 2 dimensional array:

@ a foreach {
    case (key, value) => {
      boardRep(key._1)(key._2) = value
    }
  }


@ boardRep
res8: Array[Array[String]] = Array(Array(null, null, null), Array(null, "alex", null), Array(null, null, "Jade"))

answered May 6, 2018 at 21:57

Andy Hayden

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Comments

elm · Accepted Answer · 2018-05-07 06:50:22Z

0

Using Array.tabulate it is possible to create an array and populate (some) cells by applying a given function; in this case

Array.tabulate(3,3){ (i, j) => a.getOrElse((i,j), null) }

delivers

Array(Array(null, null, null), Array(null, alex, null), Array(null, null, Jade))

answered May 7, 2018 at 6:50

elm

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