micscr,
const [a, c, d] = [1, 2, 3];
function xxx(a,b=null,c,d){
console.log(a);
console.log(b);
console.log(c);
console.log(d);
}
xxx(...[a,,c,d]);
function yyy({a,b=null,c,d}){
console.log(a);
console.log(b);
console.log(c);
console.log(d);
}
yyy({d, a, c});