Julia Language Modules Wrap Code in a Module
Example
The module keyword can be used to begin a module, which allows code to be organized and namespaced. Modules can define an external interface, typically consisting of exported symbols. To support this external interface, modules can have unexported internal functions and types not intended for public use.
Some modules primarily exist to wrap a type and associated functions. Such modules, by convention, are usually named with the plural form of the type's name. For instance, if we have a module that provides a Building type, we can call such a module Buildings.
module Buildings
immutable Building
name::String
stories::Int
height::Int # in metres
end
name(b::Building) = b.name
stories(b::Building) = b.stories
height(b::Building) = b.height
function Base.show(io::IO, b::Building)
Base.print(stories(b), "-story ", name(b), " with height ", height(b), "m")
end
export Building, name, stories, height
end
The module can then be used with the using statement:
julia> using Buildings
julia> Building("Burj Khalifa", 163, 830)
163-story Burj Khalifa with height 830m
julia> height(ans)
830
