function Person(name) {
this.name = name;
}
const john = Person('John');
The code lacks the 'new' keyword which causes issues: 1) Without 'new', 'this' binds to global object, 2) Creates unintended global variables, 3) Returns undefined instead of new object, 4) Constructor pattern requires 'new' for proper 'this' binding, 5) 'new' creates new object and sets proper prototype, 6) Common source of bugs in constructor functions.