To load code, use ```(load <filename>)```, this will add the source file to the current 'project'. A project is a light weight concept in the repl that ties together source files and compiler settings much like in an IDE like Eclipse or Visual Studio.
To build your current project, call ```(build)```. This will emit an executable or dynamic library depending on if you have defined a main-function or not. Everything emitted by the compiler will be saved in a directory named ```out``` by default. This, and other settings regarding the project can be changed by various commands. To see a list of available commands, call ```(help project)```.
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