Builder, Factory and Repository pattern with Javascript

Util content: dofacory.com/javascript/design-patterns

Builder pattern

• Useful for creating custom behaviors, using methods with descriptive names.
• It's a lot like a production line, where each employee performs a single function.

Example

myBuilderFunction
  .stepOne()
  .stepTwo()
  .stepThree()
  .stepFour()
  .finish()

Factory pattern

• Useful for concentrating instance creation in one place.
• Gives the possibility to crate some logic when creating an instance.

Example

function createOjbInstance(optionalParam) {
  const param = optionalParam || "I am a default param"
  return new MyClass(param)
}

const objOne = createObjInstance()
const objTwo = createObjInstance()
const objThree = createOjbInstance("I am an optional parameter")
const objFour = createOjbInstance()

Repository pattern

• Useful for abstracting data persistence.
• Methods have descriptive names (find, findById, findByName, create, save, delete, remove etc).

Example

const myRepository = new MyRepositoryClass()

myRepository.save({ id: "123abc", fieldOne: "one", fieldTwo: "two" })
myRepository.save({ id: "456dfg", fieldOne: "three", fieldTwo: "four" })

const allRepositoryData = myRepository.find()
// [{ id: "123abc", fieldOne: "one", fieldTwo: "two" }, { id: "456dfg", fieldOne: "three", fieldTwo: "four" }]

What the hell is Tereré?

Practically an iced tea with water or juice