new to scala anyone explain the code for me?

[jin tony]

def indexOf[T](seq: Seq[T],value: T, from: Int):Int={
   for(i<-from until seq.length){
     if(seq(i)== value) return i
   }
   -1
 }


anyone explain me indexOf[T] meaning? and what is(seq: Seq[T],value: T) do?
thank you

[Mike Simmons]

indexOf is the name of the method.  

[T] is declaring that there's a generic parameter for this method, which is named T.  This doesn't do anything here, but will be used later in:

(seq: Seq[T],value: T, from: Int) declares the method parameters - there are three:

The first is named seq and has type Seq[T]

The second is named value and has type T

The third is named from and is an Int