How to find function name from inside of itself

function FunctionA(){
  var fName = arguments.callee.toString().match(/function ([^\(]+)/)[1]
  alert('Hi, I\'m in a function named '+fName)
}

function FunctionB(){
  alert(arguments.callee.toString().match(/function ([^\(]+)/)[1]);
}

function FunctionC(){
  FunctionA();
  FunctionB();
}

FunctionC();

Example of using it in a try-catch block

try {
	// Do something here
}
catch(err) {
	LogError("Error: " + err.message + ", function " + arguments.callee.toString().match(/function ([^\(]+)/)[1] + ", line: " + err.line);
	if (debugMode) $.writeln(err.message + ", function " + arguments.callee.toString().match(/function ([^\(]+)/)[1] + ", line: " + err.line);
}

Get the name of the calling function

if (debugMode) $.writeln("Calling from '" + CallerName() + "'";
	
	function CallerName() {  
    var arr = $.stack.split(/[\n]/),  
    callerName = arr[arr.length - 3].replace(/\(.*\)/, "")  
    return callerName;  
}