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                const body=document.querySelector('body');
let osoby=["Jan Nowak","Kazimierz Zyga","Stefan Koc","Ewa Mocek","Mariusz Abramski"];

/* W poniższym przykładzie idąc od środka:
sekwencja: <h3>"+osoba.substr(osoba.indexOf(" ")+1)+"</h3>
wyszukuje spację w nazwisku, następnie wg. jej pozycji 
wycinamy tylko nazwisko,

kod>{ })
tworzy w pamięci NOWĄ tablicę z samych nazwisk,

.sort() sortuje NOWĄ tablicę alfabetycznie,

.join() łączy elementy NOWEJ tablicy i zostają one wstrzyknięte 
do elementu body. */>{return "<h3>"+osoba.substr(osoba.indexOf(" ")+1)+"</h3>"; }).sort().join(" ");