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module A

function ProcessDir(topDir)
    global dirCnt           # Declare these variables as global so they
    global fileCnt          # can be used in the main code.
    global totalSize

# Read recursively through the top, counting directories and files, totaling the 
# file space used and printing the directory or file name to stdout.

    for (root, dirs, files) in walkdir(topDir)  # walkdir function returns tuples
        for dir in dirs                         # Count directories i
            aDir = joinpath(root, dir)           # Create fule path name--same as "root * '/' * dir"
            dirCnt += 1
            println("Directory # ", dirCnt, " = ", aDir)
        end
        
        for file in files                      # Count files and total file sizes.  
            if ((file == ".") || (file == ".."))
                continue
            end
            if (endswith(file, ".md"))          # Select only files with a suffix of "".md"
                fileCnt += 1
                fn = joinpath(root,file)
                sz = stat(fn).size               # Get file permissions and file size
                totalSize += sz
                println("File # ", fileCnt, " = ", fn, ", size = ", sz)
            end
        end
    end
end

# Main processing in this module

dirCnt = 0
fileCnt = 0
totalSize = 0
subDir = ".julia"
println("Starting directory processing")
ProcessDir(joinpath(homedir(), subDir))
println("Directories = ", dirCnt, ", Files = ", fileCnt, ", Total size = ", totalSize)

end

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classAVar = <some_kind_of_cast> classB.getter().toclassA()....

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The way I understand julia is that all variables are "auto" unless you explicitly type them.

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The example I used was kind of a generalization of a lot of C++