Learning Julia

Composite types

A composite type is a collection of named fields, which can be treated as a single value. We can quickly define a composite type as:

julia> type Points       x :: Int64       y :: Int64       z :: Int64       end

We have already covered the usage in the previous section. By mutable, we mean that the fieldnames type, once assigned, can be changed and reassigned to some new value, other than the one used while creating the object. This can be understood by the example given as follows:

julia> struct Point         x::Int         y::Int         z::Int       endjulia> p = Point(1,2,3)Point(1, 2, 3)julia> p.x = 10ERROR: type Point is immutable

We see that we were not able to change the values of x, y, and z once they were assigned at the time of object creation. The ERROR: type Point ...