I am reading a file composed of lines in the format a=b.
Using Source.fromFile("file").getLines I get an Iterator[String]. I figure I need to split the strings into tuples and then form the map from the tuples - that is easy. I am not being able to go from the Iterator[String] to an Iterator[(String,String)].
How can I do this? I am a beginner to scala and not experienced with functional programming, so I am receptive to alternatives :)
You can do so by splitting the string and then creating the tuples from the first and second elements using Iterator.map:
val strings = List("a=b", "c=d", "e=f").iterator
val result: Iterator[(String, String)] = strings.map { s =>
val split = s.split("=")
(split(0), split(1))
}
If you don't mind the extra iteration and intermediate collection you can make this a little prettier:
val result: Iterator[(String, String)] =
strings
.map(_.split("="))
.map(arr => (arr(0), arr(1)))
You can transform the values returned by an Iterator using the map method:
def map[B](f: (A) ⇒ B): Iterator[B]
Maybe like this?
Source.fromFile("file").getLines.map(_.split("=").map( x => (x.head,x.tail) ) )
You might want to wrap this into Try.
mkString("=") on the tail, so you are sure you have (String,String), no matter how many splits there were.This is my try:
val strings = List("a=b", "c=d", "e=f")
val map = strings.map(_.split("=")).map { case Array(f1,f2) => (f1,f2) }
