This example demonstrates a JavaScript debugging utility called `runWithDebugger`, which invokes a callback function while pausing execution at a `debugger` statement. The code defines multiple test functions, such as `sayHi`, `sayHiTo`, and `sayFullName`, that log messages to the console via `console.log`. The utility handles zero to four arguments by explicitly branching on the length of the supplied arguments array, then calls the callback with the appropriate parameters. The page relies solely on native browser debugging tools and plain JavaScript, with no external libraries or data sources.