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The builder pattern is a creational design pattern used to create objects. It builds a complex object using simple objects by providing a step by step approach. Builder pattern uses fluent API to create objects.

JavaScript Builder Pattern Example

The example creates an object using the builder design pattern.

let User = function (firstName, lastName, email) { this.firstName = firstName; this.lastName = lastName; this.email = email; } let UserBuilder = function () { let firstName; let lastName; let email; return { setFirstName: function (firstName) { this.firstName = firstName; return this; }, setLastName: function (lastName) { this.lastName = lastName; return this; }, setEmail: function (email) { this.email = email; return this; }, info: function () { return `${this.firstName} ${this.lastName}, ${this.email}`; }, build: function () { return new User(firstName, lastName, email); } }; }; var user = new UserBuilder().setFirstName('Ramesh').setLastName('Fadatare') .setEmail('ramesh@gmail.com'); console.log(user.info());

Output:

Ramesh Fadatare, ramesh@gmail.com

Demo

For the best learning experience, I highly recommended that you open a console (which, in Chrome and Firefox, can be done by pressing Ctrl+Shift+I), navigate to the "console" tab, copy-and-paste each JavaScript code example from this guide, and run it by pressing the Enter/Return key.

JavaScript Design Patterns

• JavaScript EventBus Example - Subscribe/Publish Listeners

• JavaScript Publish/Subscribe Pattern Example //Popular

• JavaScript Factory Pattern with Example //Popular

• JavaScript Prototype Pattern with Example //Popular

• JavaScript Constructor Pattern with Example //Popular