Hands-On Design Patterns and Best Practices with Julia

Developing the LModel object

To develop the LModel object, perform the following steps:

1. Let's first create a type called LModel to keep track of the axiom and the set of rules. The struct can be defined as follows:

struct LModel    axiom    rulesend

2. Then, we can add a constructor that populates the axiom field and initializes the rules field:

"Create a L-system model."LModel(axiom) = LModel([axiom], Dict())

3. By design, the axiom is an array of a single element. The rules are captured in a dictionary for fast lookups. An add_rule! function is also written to append new rules to the model:

"Add rule to a model."function add_rule!(model::LModel, left::T, right::T) where {T <: AbstractString}    model.rules[left] = split(right, "") return nothing ...