How to generate the random values of map from a given set of values and then store the key and values into separate variables in scala - list

Question

I am trying to generate the 1000 random key-val map pairs from the given(statically defined) 2 map key-val pairs in scala and also later i would want to break the key and value pairs and store them into separate variables
Whatever i have tried:
object methodTest extends App{
val testMap = Map("3875835"->"ABCDE","316067107"->"EFGHI")
def getRandomElement(seq: Map[String,String]): Map[String,String] = {
seq(Random.nextInt(seq.length))
}
var outList = List.empty[Map[String,String]]
for(i<-0 to 1000){
outList+=getRandomElement(testMap)
}
print(outList)
}
The Output should generate 1000 Key-val pairs of map like i am showing below
[3875835,ABCDE]
[316067107,EFGHI]
[3875835,ABCDE]
[316067107,EFGHI]
[316067107,EFGHI]
............
............
............. upto 1000 random key-val pairs
Please help me figure out where i am going wrong and let me know How to resolve it, if any issue regarding the requirement, please feel free to comment for it

Answer 1

You can transform your seed map testMap into sequence of key/value tuples using .toSeq and then generate key/value pairs by iterating over the list of numbers from 0 until 1000, associating each number to a random choice between first or second element of the seed:
import scala.util.Random
val testMap = Map("3875835" -> "ABCDE", "316067107" -> "EFGHI")
val seed = testMap.toSeq
val keyValuesList = (0 until 1000).map(index => seed(Random.nextInt(seed.size)))
Note: 0 until 1000 will return all the numbers from 0 to 1000 excluded, so 1000 numbers. If you use 0 to 1000 you will get all the numbers from 0 to 1000 included, so 1001 numbers.
If you want to print the resulting list, you can use .foreach method with println function as argument:
keyValuesList.foreach(println)
And you will get:
(3875835,ABCDE)
(316067107,EFGHI)
(3875835,ABCDE)
(3875835,ABCDE)
(316067107,EFGHI)
(3875835,ABCDE)
...
if you want to keep only the keys, you can iterate on the list using .map method, taking only the first element of the tuple by using ._1 method, that retrieve the first element of a tuple:
val keys = keyValuesList.map(keyValuePair => keyValuePair._1)
And if you want only a list containing all second elements of each pair:
val values = keyValuesList.map(keyValuePair => keyValuePair._2)