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Think -> Code -> Solve

ShankarShastri shankarshastri

Think -> Code -> Solve
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shankarshastri / gist:4d496958d7d0b06f568ee043f2637ab4
Created Jan 2, 2020 — forked from cvogt/gist:9193220
Slick: Dynamic query conditions using the **MaybeFilter** (Updated to support nullable columns)
View gist:4d496958d7d0b06f568ee043f2637ab4
import scala.slick.lifted.CanBeQueryCondition
// optionally filter on a column with a supplied predicate
case class MaybeFilter[X, Y](val query: scala.slick.lifted.Query[X, Y]) {
def filter[T,R:CanBeQueryCondition](data: Option[T])(f: T => X => R) = { => MaybeFilter(query.filter(f(v)))).getOrElse(this)
// example use case
import java.sql.Date

Applied Functional Programming with Scala - Notes

Copyright © 2016-2018 Fantasyland Institute of Learning. All rights reserved.

1. Mastering Functions

A function is a mapping from one set, called a domain, to another set, called the codomain. A function associates every element in the domain with exactly one element in the codomain. In Scala, both domain and codomain are types.

val square : Int => Int = x => x * x
shankarshastri / redis-master.yaml
Last active Jan 29, 2020
Redis And Redis Insight
View redis-master.yaml
apiVersion: v1
kind: Service
name: redis-service
type: LoadBalancer
app: redis
- name: redis
View KafkaProducerConsumerAvro.scala
import java.time.Duration
import java.util.concurrent.Executors
import java.util.{Properties, Timer, TimerTask, UUID}
import Models.{Message, SystemMessage, UserMessage, msgAvroSchema}
import com.sksamuel.avro4s.{AvroInputStream, AvroOutputStream, AvroSchema}
import org.apache.kafka.clients.consumer._
import org.apache.kafka.clients.producer._
import org.apache.kafka.common.errors.WakeupException
shankarshastri /
Created May 9, 2020 — forked from cecilemuller/
How to setup Let's Encrypt for Nginx on Ubuntu 18.04 (including IPv6, HTTP/2 and A+ SSL rating)

How to setup Let's Encrypt for Nginx on Ubuntu 18.04 (including IPv6, HTTP/2 and A+ SLL rating)

Virtual hosts

Let's say you want to host domains and

Create folders for their files:

shankarshastri /
Created May 9, 2020 — forked from cecilemuller/
How to create an HTTPS certificate for localhost domains

How to create an HTTPS certificate for localhost domains

This focuses on generating the certificates for loading local virtual hosts hosted on your computer, for development only.

Do not use self-signed certificates in production ! For online certificates, use Let's Encrypt instead (tutorial).

shankarshastri / Client example
Created Jun 8, 2020 — forked from rklaehn/Client example
akka http file server
View Client example
package akkahttptest
import akka.http.Http
import{Sink, Source}
import akka.http.model._
object TestClient extends App {
View Trie.scala
case class TrieNode[T](edgeList: Map[T, TrieNode[T]] = Map.empty[T, TrieNode[T]], isLeaf: Boolean = false,
isEntry: Boolean = false)
object TrieNode {
def emptyTrieNode[T]: TrieNode[T] = {
def newTrieNode[T](data: T): TrieNode[T] = {
TrieNode[T](edgeList = Map[T, TrieNode[T]]((data, emptyTrieNode[T])))
View ImmutableTrie.scala
import scala.annotation.tailrec
import scala.collection.immutable.HashMap
case class TrieNode(h: HashMap[Char, TrieNode], isWord: Boolean = false)
object TrieNode {
def empty = TrieNode(HashMap.empty)
def buildTrieNode(s: List[Char], t: TrieNode = TrieNode.empty): TrieNode = {
s match {
case Nil => t.copy(isWord = true)
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