diff --git a/Javascript/program-14/program.js b/Javascript/program-14/program.js
new file mode 100644
index 00000000..0893b4da
--- /dev/null
+++ b/Javascript/program-14/program.js
@@ -0,0 +1,74 @@
+`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);
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