JSFiddle - React, Tailwind, and code Playground
JavaScript
var a = "hola mundo bye world",
b = "hola amigos bye buddy",
ax = a.split(" "),
bx = b.split(" "),
c = [];
ax.forEach(function(w){
if (b.indexOf(w) < 0){
c.push(w);
}
});
bx.forEach(function(w){
if (a.indexOf(w) < 0){
c.push(w);
}
});
document.body.innerHTML = c.join(" "); //hola mundo bye world amigos buddy