Answer / Sunil Kumar Rastogi

The Builder pattern separates the construction of a complex object from its representation. It allows the same construction process to create different representations (variations) of an object.nnThe Builder provides an interface for creating parts of a product, and it lets you produce complex objects step by step.nnHere is an example in JavaScript:n```javascriptnclass Director {n constructor() {n this._builder = null;n }nn setBuilder(builder) {n this._builder = builder;n }nn construct(n productType, n partsA, n partsB, n partsCn ) {n this._builder.reset();n this._builder.setPartA(partsA);n this._builder.setPartB(partsB);n this._builder.setPartC(partsC);n return this._builder.getProduct(productType);n }n}nnclass Builder {n constructor() {n this._product = null;n this._partA = null;n this._partB = null;n this._partC = null;n }nn reset() {n this._product = null;n this._partA = null;n this._partB = null;n this._partC = null;n }nn setPartA(part) {n this._partA = part;n }nn setPartB(part) {n this._partB = part;n }nn setPartC(part) {n this._partC = part;n }nn getProduct(productType) {n if (productType === 'ConcreteProduct1') {n this._product = new ConcreteProduct1();n } else if (productType === 'ConcreteProduct2') {n this._product = new ConcreteProduct2();n }n this._product.addPartA(this._partA);n this._product.addPartB(this._partB);n this._product.addPartC(this._partC);n return this._product;n }n}n```

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