`Constructor Functions

* Create multiple objects with same body using a constructor function`

function Person(name, age){

this.name = name;

this.age = age;

this.greeting = function() {

console.log(`hi ${name}`);

}

}

// defining methods outside the constructor

Person.hey = function() {console.log("hello")};

Person.hey();

Person.prototype.welcome = function() {

console.log(`welcom ${this.name}`);

}

let obj = new Person('abc', 21);

obj.gender = function(gen) {

console.log(this.name, gen);

};

obj.gender("male");

console.log(obj);

console.log(obj["name"]);

console.log(obj.age);

obj.greeting();

obj.welcome();

function Human(name, age, gender) {

Person.call(this, name, age);

this.gender = gender;

this.greet = function() {

console.log(`hello ${this.name}`);

}

}

let obj2 = new Human('abc', 21, "male");

console.log(obj);

let obj3 = new Human('abcd', 22, "female");

console.log(obj2);

let test1 = {

string: "hey",

}

let test2 = {

number: 50,

}

// copying objects

Object.assign(test1, test2);

test2.number = 60;

console.log(test1);

console.log(test2);

console.log('test' in test1);

// obj2.greet();

// obj2.greeting();

// obj3.greeting();

// console.log("name" in obj);

function a() {

console.log("12");

return function() {

return 1;

}

}

let b = a();

console.log(b);