Elixir Design Patterns

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Creational patterns

Builder

See https://en.wikipedia.org/wiki/Builder_pattern

The simplest way to build a struct.

car = Car.new("Blues Mobil")
# Or full struct
car = %Car{name: "Blue Ocean", color: :blue, color_doors: :cyan}

With a builder

CarBuilder.build()
    |> name("Blues Mobil")
    |> color_doors(:black)

Or with the Director

car = CarDirector.construct("Blues Mobil")

Builder Test

Singleton

This is useful when exactly one object is needed to coordinate actions across the system.

Singleton Test

See https://en.wikipedia.org/wiki/Singleton_pattern

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Copyright © 2018 Edwin Bühler