Working of map function on data

Question

Suppose we have a "customer" file with the data - 
1 vishal
2 vijay
3 vinay

if I create an RDD

val cust = sc.textfile("home\customer.txt").map(_.split(" "))

What operation are map and split going to perform? Can you please explain this to me?

Answer 1

The map function creates an array of arrays and the split function defines the delimiter in the dataset. Refer to the below screenshot

Since the dataset was delimited by space, we wrote the split function as - split(" ").  If our dataset was delimited by tab, then we would have to specify "\t" in the split function.