Count functions calls with JavaScript

Question

For example: I have a lot of functions and use them many times. I need to count calls for each function. What is the best practice to make it?

At first i thought i need

Answer 1

In the simplest case, you can decorate each function with a profiling wrapper:

_calls = {}

profile = function(fn) {
    return function() {
        _calls[fn.name] = (_calls[fn.name] || 0) + 1;
        return fn.apply(this, arguments);
    }
}

function foo() {
    bar()
    bar()
}

function bar() {
}

foo = profile(foo)
bar = profile(bar)

foo()
foo()

document.write("
" + JSON.stringify(_calls,0,3));

For serious debugging, you might be better off with a dedicated profiler (usually located in your browser's console).