NicolaeNMV

// Multistep encoding of ascii to binary->base64
// As the binary will be presented as blocks of 0,1 separated by space. 
// The base64 result will contain patterns such as MTA, MCA, IDE.

val message = "Hello World !"

def encode(message: String): String =
  java.util.Base64.getEncoder().encodeToString( message.map(_.toBinaryString).mkString(" ").map(_.toByte).toArray )

def decode(base64: String): String =

NicolaeNMV

#!/usr/bin/env amm
import $ivy.`com.typesafe.akka::akka-stream:2.4.16`
import java.nio.file.Paths

import akka.NotUsed
import akka.stream._
import akka.stream.scaladsl._
import akka.actor.ActorSystem
import akka.util.ByteString

NicolaeNMV

Missing resource

Scala code run from Intellij Worksheet doesn't seem to be able to find the akka actor resources.

The error is:

com.typesafe.config.ConfigException$Missing: No configuration setting found for key 'akka'

There is an opened ticket on Intellij bugtracker https://youtrack.jetbrains.com/issue/SCL-9229 with a work arround

NicolaeNMV

#!/bin/sh
export PYSPARK_DRIVER_PYTHON="/usr/local/bin/jupyter"
export PYSPARK_DRIVER_PYTHON_OPTS="notebook --NotebookApp.open_browser=False --NotebookApp.ip='*' --NotebookApp.port=8880"
export PYSPARK_PYTHON="/usr/bin/python"
pyspark

NicolaeNMV

The default utf8 character set doesn't support emoji characters, you'll see `[SQLException: Incorrect string value: '\xF0\x9F\x98\x8A P...' for ` exception when trying to insert data.

You'll need utf8mb4 character set to be able to sotre emoji characters.

1. You'll need to create all the tables with CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci option
2. After initializing the conneciton, you will need to send SET NAMES utf8mb4,
you can do that with the hikari connectionInitSql option, a SQL statement that will be executed after the connetion was initialized.

slick.dbs.default.db.connectionInitSql="set names utf8mb4"

NicolaeNMV

In playframework 2.4, if you get the error

object Application is not a member of package controllers
Note: class Application exists, but it has no companion object.

It's because the class is not instantiated. You need to add

routesGenerator := InjectedRoutesGenerator

NicolaeNMV

If you were playing with reactive-stream, and you got this error

scala> val sum = source.runWith(sink)
<console>:14: error: could not find implicit value for parameter materializer: akka.stream.FlowMaterializer

You need an implicit FlowMaterializer

def runWith[Mat2](sink: Graph[SinkShape[Out], Mat2])(implicit materializer: FlowMaterializer): Mat2

NicolaeNMV

/* @flow */

var a = {
  "a":"a",
  "b":"b"
}
var res = a.c;

// $ flow simple.js
// $ No errors!

NicolaeNMV

import play.api.libs.json.{Json, Format}

// If you imported 
import play.modules.reactivemongo.json.BSONFormats.BSONObjectIDFormat
// And still getting No implicit format for reactivemongo.bson.BSONObjectID available. error
// Check that your JSON formatter is typed. Change 
implicit val mongoFormat = Json.format[Category]
// to
implicit val mongoFormat: Format[Category] = Json.format[Category]

NicolaeNMV

/*
routes:

GET     /test                       controllers.Application.test(route: String)
GET     /guessThat                  controllers.Application.guessIt

// To check:

/test?route=/guessIt