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Durga Gadiraju dgadiraju

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@dgadiraju
dgadiraju / func-higher-order.scala
Last active September 14, 2017 14:51
//recursive
def sum(f: Int => Int, a: Int, b: Int): Int = {
if(a > b) 0 else f(a) + sum(f, a + 1, b)
}
//non recursive
def sum(f: Int => Int, a: Int, b: Int): Int = {
var res = 0
for(ele <- a to b by 1)
res = res + f(ele)
@dgadiraju
dgadiraju / func-anonymous.scala
Last active June 28, 2017 03:08
//recursive
def sum(f: Int => Int, a: Int, b: Int): Int = {
if(a > b) 0 else f(a) + sum(f, a + 1, b)
}
//non recursive
def sum(f: Int => Int, a: Int, b: Int): Int = {
var res = 0
for(ele <- a to b by 1)
res = res + f(ele)
@dgadiraju
dgadiraju / list-operations-map-reduce.scala
Last active May 10, 2017 00:09
os.map(x => x.orderDate.replace("-", "").toInt).foreach(println)
os.filter(x => x.orderStatus == "COMPLETE")
(1 to 100).filter(_ % 2 == 0).reduce((a, b) => a + b)
@dgadiraju
dgadiraju / list-operations-sort.scala
Last active May 10, 2017 00:05
os.sortBy(x => x.orderCustomerId)
os.sortWith((a, b) => {
if(a.orderCustomerId > b.orderCustomerId)
false
else if(a.orderCustomerId < b.orderCustomerId)
true
else {
if(a.orderId > b.orderId)
false
else
@dgadiraju
dgadiraju / list-operations-grouping.scala
Last active May 10, 2017 00:04
os.groupBy(x => x.orderStatus)
//To get count by order status
os.groupBy(x => x.orderStatus).map(x => (x._1, x._2.size)).foreach(println)
@dgadiraju
dgadiraju / list-operations-create.scala
Created May 10, 2017 00:08
case class Order(
orderId: Int,
orderDate: String,
orderCustomerId: Int,
orderStatus: String
)
val os = List(
Order(1, "2017-01-01", 100, "COMPLETE"),
Order(2, "2017-01-01", 20, "CLOSED"),
@dgadiraju
dgadiraju / fraction.scala
Created May 10, 2017 06:48
/**
* Created by itversity on 10/05/17.
*/
class Fraction(val n: Int, val d: Int) {
override def toString = n + "/" + d
def result = n/d.toDouble
def +(f: Fraction) = {
new Fraction(((n*f.d) + (f.n*d)), (d * f.d))
}
}
@dgadiraju
dgadiraju / set-additions-removals-operations.scala
Last active May 14, 2017 05:15
//os is of type immutable set,
//hence elements cannot be added to set
//+=, ++=, -=, --= will not work
val os = Set(
Order(1, "2017-01-01", 100, "COMPLETE"),
Order(2, "2017-01-01", 20, "CLOSED")
)
//Creating new set by adding element
os + Order(3, "2017-01-01", 301, "PENDING")
@dgadiraju
dgadiraju / set-set-operations.scala
Last active May 14, 2017 05:14
val os1 = Set(
Order(1, "2017-01-01", 100, "COMPLETE"),
Order(2, "2017-01-01", 20, "CLOSED")
)
val os2 = Set(
Order(2, "2017-01-01", 20, "CLOSED"),
Order(3, "2017-01-01", 301, "PENDING"),
Order(4, "2017-01-01", 202, "CLOSED"),
@dgadiraju
dgadiraju / order.scala
Last active May 14, 2017 05:15
case class Order(
orderId: Int,
orderDate: String,
orderCustomerId: Int,
orderStatus: String
)