Ubuntu Jammy Install MySQL via the Oracle PPA with Modern GPG / Public Key Keyring Method

export GNUPGHOME=/tmp/gpg

mkdir -p /etc/apt/keyrings/

mkdir -p /tmp/gpg

cd /tmp/gpg

gpg --batch --keyserver keyserver.ubuntu.com --recv-keys '859BE8D7C586F538430B19C2467B942D3A79BD29'

gpg --batch --export '859BE8D7C586F538430B19C2467B942D3A79BD29' > /etc/apt/keyrings/mysql.gpg

echo 'deb [ signed-by=/etc/apt/keyrings/mysql.gpg ] http://repo.mysql.com/apt/ubuntu/ jammy mysql-8.0' > /etc/apt/sources.list.d/mysql.list

gpgconf --kill all

rm -rf /tmp/gpg

apt install mysql-server

#todo: script initial config & removal of insecure logins

Javascript OOP Classes are not real-- it is just syntactic sugar!

class MyBaseClass {

    constructor(thingOne, thingTwo) {

        this.thingOne = thingOne;

        this.thingTwo = thingTwo;

    }

    getThingOne() {

        return this.thingOne;

    }

    getThingTwo {

        return this.thingTwo;

    }

}

class MyExtendedClass extends MyBaseClass {

    constructor(thingOne, thingTwo, thingThree) {

        super(thingOne, thingTwo);

        this.thingThree = "thingThree"

    }

    getThingThree() {

        return this.thingThree;

    }

}

let theThings = new MyExtendedClass("foo", "bar", "baz");

This is the helper way to write the following:

function MyBaseClass (thingOne, thingTwo) {

    let newMyBaseClass = Object.create(myBaseClassConstructor);

    newMyBaseClass.thingOne = thingOne;

    newMyBaseClass.thingTwo = thingTwo;

    return newMyBaseClass;

}

let myBaseClassConstructor = {

    getThingOne: function() {

        return this.thingOne;

    },

    getThingTwo: function() {

        return this.thingTwo;

    }

}

function MyExtendedClass(thingOne, thingTwo, thingThree) {

    let newMyExtendedClass = MyBaseClass(thingOne, thingTwo);

    Object.setPrototypeOf(newMyExtendedClass, myExtendedClassConstructor);

    newMyExtendedClass.thingThree = thingThree;

    return newMyExtendedClass;

}

let myExtendedClassConstructor = {

    getThingThree: function() {

        return this.thingThree;

    }

}

Object.setPrototypeOf(myExtendedClassConstructor, myBaseClassConstructor);

const theSquare = MyBaseClass(2,3);

theSquareArea = theSquare.getThingOne() * theSquare.getThingTwo();

const theBox = MyExtendedClass(2, 3, 5);

theCubicVolume = theBox.getThingOne() * theBox.getThingTwo() * theBox.getThingThree();