Is it possible to modify a function itself when its property function is called?

Question

Basically I want to do this:

someFunction() // do something

someFunction.somePropertyFunction()

someFunction()  // Now someFunction is modified; it should now          


        

Answer 1

Sort of:

function someFunction() {
    return realFunction.apply(this, arguments);
}

function someFunctionA(name) {
    return 'Hello, ' + name + '!';
}

function someFunctionB(name) {
    return 'Goodbye, ' + name + '...';
}

var realFunction = someFunctionA;

someFunction.somePropertyFunction = function () {
    realFunction = someFunctionB;
};