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Struct

Collection of values. Immutable.

Genral declaration syntax:

struct <name>
  <var1>
  <var2>
  <varN>
  
  #empty constructor
  function <struct_name>()
      new(1,1,1) #assigns 1, 1, 1 to above
  end
  
  # accepts args, and does condition check
  function <struct_name>(<varX>,<varY>,...<varZ>)
      #do condition check
      error("wahtever")
      #now create and assign 
      new(<varX>,<varY>,....<varZ>)
  end
end

Default constructor will initialize the variable when creating the object as follows:

p = Prism(2,3,4)

This automatically assigns values inorder to <var1>, <var2> ... <varN>.

Accessing vars inside:

<struct obj>.<varN_name>

---

Mutable Struct

CAN make the constructor OUTSIDE of struct:

```julia mutable struct Circle r end

function Circle_const(r::Real) Circle(r) end