Hands-On Design Patterns and Best Practices with Julia

Reporting accessible fields

A development environment can often help a programmer to enter field names correctly. In the Julia REPL, when I press the Tab key twice after entering the dot character, it will try to autocomplete and display the available field names:

Now that we have implemented the getproperty and setproperty! functions, the list is no longer accurate. More specifically, the loaded field should not be displayed because it can neither be accessed nor changed. In order to fix this, we can simply extend the propertynames function, as follows:

function Base.propertynames(fc::FileContent)    return (:path, :contents)end

The propertynames ...