JavaScript двойной вопрос
let a = null;
const b = a ?? -1; // Same as b = ( a != null ? a : -1 );
console.log(b); // output: -1
//OR IF
let a = 9;
const b = a ?? -1;
console.log(b); // output: 9
//PS.,VERY CLOSE TO '||' OPERATION IN FUNCTION, BY NOT THE SAME
Lazurite