Rajkumar Goel wrote:
> What is the difference between List.flatten and List.concat
> Both do the same operation ,then why two lists.
Hello Raj,
They both return the concatenation but one takes a list as a parameter &
other takes list of lists...
*def concat [A](xss : List[A]) : List[A]*
Concatenate all the argument lists into a single list.
Parameters
xss - the lists that are to be concatenated
Returns
the concatenation of all the lists...
scala> List.concat(List('a'),List('b'))
res0: List[Char] = List(a, b)
*def flatten[A](xss : List[List[A]]) : List[A]*
Concatenate all the elements of a given list of lists.
Parameters
xss - the list of lists that are to be concatenated
Returns
the concatenation of all the lists...
scala> val xss = List(List('c'),List('d'),List('e'))
xss: List[List[Char]] = List(List(c), List(d), List(e))
scala> List.flatten(xss)
res1: List[Char] = List(c, d, e)
hope this helps.
--
Cheers,
Pratik K Anand
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