Hands-On Design Patterns and Best Practices with Julia

Developing a command processor

Our first attempt to implement a command process that may look similar to the following:

function process_command(command::String, args)    if command == "open"        # open a file    elseif command == "close"        # close current file    elseif command == "exit"        # exit program    elseif command == "help"        # pops up a help dialog    else        error("bug - this should have never happened.")    endend

The process_command function simply takes the command as a string. Then, depending on the value of the string, it will call the respective function. The args argument may be passed by the GUI code for additional information; for example, the path of the file that is being opened or closed.

There is nothing wrong with this code from a logical perspective, ...