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let myArray = [2, 4, 6];
let pos: number = myArray.indexOf(4);
if (pos > -1) {
  myArray.splice(pos, 1);
}
console.log(myArray);  // Ergebnis: [2, 6]

const myObj = {
  name: "Hugo Hüpfer",
  age: 42
};

let myClone = Object.assign({}, myObj);

gegenstand | preis | idVerkaeufer | idKaeufer
-----------|-------|--------------|----------
Reifen     |   500 | 1234         | 1235
Kette      |   200 | 1235         | 1234

id   | Name 
-----|------------
1234 | Hugo Hüpfer
1235 | Trude Tropf

SELECT t.gegenstand, t.preis, pv.name AS name_verkaufer, pk.name AS name_kaeufer FROM transaktionen AS t
              JOIN person AS pv ON t.idVerkaeufer=pv.id
              JOIN person AS pk ON t.idKaeufer=pk.id

gegenstand | preis | name_verkaeufer | name_kaeufer
-----------|-------|-----------------|----------
Reifen     |   500 | Hugo Hüpfer     | Trude Tropf
Kette      |   200 | Trude Tropf     | Hugo Hüpfer

<img src="myImage.png" style="display: block; margin: auto">

sudo systemctl stop mariadb
sudo mysqld_safe --skip-grant-tables &
sudo mysql

ALTER USER 'root'@'localhost' IDENTIFIED BY 'myNewPassword';

sudo systemctl start mariadb

SELECT * FROM myTable WHERE myColumn IS NULL

<link rel="stylesheet" href="/css/mycss.css">

<div style="position: relative">
  <div style="position: absolute; margin-top: 0.2rem; margin-right: 0.2rem">
  </div>
</div>

myVar = void 0;