4. You want to print the incremental count each time you instantiate a object using new in JS
class Key {
// The static property
static lastKey = 0;
// The instance property using the class fields proposal syntax
// Note I didn't initialize it with 1, that's a bit misleading.
key;
constructor() {
// Increment and assign
this.key = ++Key.lastKey;
}
print_key() {
console.log(this.key)
}
}
const key1 = new Key();
const key2 = new Key();
const key3 = new Key();
key1.print_key();
key2.print_key();
key3.print_key();