The prototype is a fundamental concept of JavaScript and its must to known JavaScript developers.

All the JavaScript objects has an object and its PROPERTY called prototype and its used to ADD and the custom functions and property.

The example without prototype as given below.

var employee = function () {
//This is a CONSTRUCTOR function.
}

//Create the instance of above constructor function and assign in a variable

var empInstance = new employee();
empInstance.deportment = "IT";

console.log(empInstance.deportment);//The OUTPUT of above is IT. The example with prototype as given below.

var employee = function () { //This is a constructor function.}
employee.prototype.deportment = "IT";//Now, for every instance employee will have a deportment.
//Create the instance of above constructor function and assign in a variable
var empInstance = new employee();
empInstance.deportment = "HR";
console.log(empInstance.deportment);//The output of above is IT not HR.

The prototype is a fundamental concept of JavaScript and its must to known JavaScript developers.

All the JavaScript objects has an object and its property called prototype and its used to add and the custom functions and property.

The example without prototype as given below.

var employee = function () {
//This is a constructor function.
}

//Create the instance of above constructor function and assign in a variable

var empInstance = new employee();
empInstance.deportment = "IT";

console.log(empInstance.deportment);//The output of above is IT. The example with prototype as given below.

var employee = function () { //This is a constructor function.}
employee.prototype.deportment = "IT";//Now, for every instance employee will have a deportment.
//Create the instance of above constructor function and assign in a variable
var empInstance = new employee();
empInstance.deportment = "HR";
console.log(empInstance.deportment);//The output of above is IT not HR.