未指定的值参数：用于Scala中的数组

Question

 def rearrange(str: String) = {
    var indexes = Array[Int]()
    indexes = allIndexes(0, str, indexes)
    indexes foreach( println(_) )
  }

  def allIndexes(position: Int, str: String, tokens: Array[String], indexes: Array[Int]): Array[Int] ={
    tokens foreach( (e) => {
      var pos = str.indexOf(e, position)
      if (pos != -1){
        return allIndexes(pos, str, (indexes:+ pos))
      }else{
        return indexes
      }
    })
  }

What it complaining about? How to solve it?

Answer 1

The method allIndexes requires 4 parameters, but you call the method only with 3 arguments. Thus, the compiler is complaining that the parameter indexes is unspecified.