Scala Tuple to String (using mkString)

Question

Suppose I have a list of tuples

('a', 1), ('b', 2)...

How would one get about converting it to a String in the format

a 1
b 2

I tried using collection.map(_.mkString('\t')) However I'm getting an error since essentially I'm applying the operation to a tuple instead of a list. Using flatMap didn't help either

Pijusn · Accepted Answer · 2016-08-01 10:01:07Z

32

For Tuple2 you can use:

val list = List(("1", 4), ("dfg", 67))
list.map { case (str, int) => s"$str $int"}

For any tuples try this code:

val list = List[Product](("dfsgd", 234), ("345345", 345, 456456))

list.map { tuple => 
  tuple.productIterator.mkString("\t")
}

edited Aug 1, 2016 at 10:01

Pijusn

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answered Nov 5, 2014 at 7:07

Sergii Lagutin

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3 Comments

Ashwini Khare Over a year ago

will this take care of adding a \n after every tuple?

Sergii Lagutin Over a year ago

No. It maps every tuple to string. If you want \n after lines use mkString on result list.

My other car is a cadr Over a year ago

I don't think the toList after the productIterator is necessary.

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