new operator and function constructor in Javascript
Constructor function
- The constructor function can be created with a new keyword
- When a new operator is used to create a function the following things happen
How it works
- The new empty object is created
- The function is called and this keyword is set
- An empty object is linked to a prototype
- The function returns the empty object
let Employee = function (name, department) {
console.log(this);
this.name = name;
this.department = department;
console.log(this);
}
let john = new Employee('John', 'Software');
console.log(john);
// Employee {}
// Employee { name: 'John', department: 'Software' }
// Employee { name: 'John', department: 'Software' }