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Background

While Kotlin is not a pure functional language, it provides Higher order functions and an expressive way of writing programs vs statements provided by imperative languages like Java.

Functions

Function declaration

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[
  {"isoCode": "AT", "name": "Austria"},
  {"isoCode": "BE", "name": "Belgium"},
  {"isoCode": "BG", "name": "Bulgaria"},
  {"isoCode": "HR", "name": "Croatia"},
  {"isoCode": "CY", "name": "Cyprus"},
  {"isoCode": "CZ", "name": "Czech Republic"},
  {"isoCode": "DK", "name": "Denmark"},
  {"isoCode": "EE", "name": "Estonia"},
  {"isoCode": "FI", "name": "Finland"},

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import javax.crypto.Mac
import javax.crypto.spec.SecretKeySpec

import org.apache.commons.codec.binary.Hex

val sharedSecret = "whsec_A2EdfajGiGHx9jFmkP7ia6j25VXh9IWV"

val payload = "{\n  \"id\": \"evt_YEEz4JGN6UwGkCjdqr7wfPqL\",\n  \"object\": \"event\",\n  \"api_version\": \"2017-06-05\",\n  \"created\": 1509023721,\n  \"data\": {\n    \"object\": {\n      \"id\": \"my-first-test-plan\",\n      \"object\": \"plan\",\n      \"amount\": 599,\n      \"created\": 1509023721,\n      \"currency\": \"gbp\",\n      \"interval\": \"month\",\n      \"interval_count\": 1,\n      \"livemode\": false,\n      \"metadata\": {\n      },\n      \"name\": \"My first test plan\",\n      \"statement_descriptor\": \"My first test plan\",\n      \"trial_period_days\": 31\n    }\n  },\n  \"livemode\": false,\n  \"pending_webhooks\": 1,\n  \"request\": {\n    \"id\": \"req_6UwGkCjdqr7wfPqLAq\",\n    \"idempotency_key\": null\n  },\n  \"type\": \"plan.created\"\n}"
val header = "t=1509023726,v1=e786c1d46f2fa3bbd57cf974e89533ecb89b

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import cats._
import cats.data.Validated.{Invalid, Valid}
import cats.data.{ValidatedNel, _}
import cats.implicits._

case class Person(name: String, jobTitle: String, age: Int)
case class Error(msg: String)

type ValidationResult[T] = ValidatedNel[Error,T]

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package nicocavallo.contentful

import java.time.ZonedDateTime

import com.contentful.java.cda._
import com.typesafe.config.Config
import org.reactivestreams.{Subscriber, Subscription}

import scala.concurrent.{Future, Promise}
import scala.language.postfixOps

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param(
    $confPath = "./conf.txt"
)

while (1)
{

    $props = convertfrom-stringdata (get-content -path $confPath -raw)
    
    $period = [convert]::ToInt32($props.'app.interval', 10)

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Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

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lazy val root = (project in file("."))
  .enablePlugins(PlayScala, SbtLiquibase, BuildInfoPlugin)
  .settings(
    buildInfoKeys := Seq[BuildInfoKey](name, version, scalaVersion, sbtVersion,
      "buildNumber" -> Option(System.getenv("BUILD_NUMBER")).getOrElse("n/a"),
      "gitCommit" -> Option(System.getenv("GIT_COMMIT")).getOrElse("n/a"),
      "gitBranch" -> Option(System.getenv("GIT_BRANCH")).getOrElse("n/a")
    ),
    buildInfoPackage := "picsolve.jenkins.metadata",