Apache Spark - Transformations - map & filter

Map Transformation code in Scala

val arr = 1 to 10000
val nums = sc.parallelize(arr)
def multiplyByTwo(x:Int):Int = x*2
multiplyByTwo(5)

[Out]: 10

var dbls = nums.map(multiplyByTwo);
dbls.take(5)

[Out]: [2, 4, 6, 8, 10]

Transformations - filter() code in Scala

var arr = 1 to 1000
var nums = sc.parallelize(arr)
def isEven(x:Int):Boolean = x%2 == 0

var evens = nums.filter(isEven)
evens.take(3)