I must find a way to revise all the functions in order to track the number of times each one is executed throughout the lifespan of the program

In my system, there is a square function that looks like this:

function square(a) {
  console.log(a);
  return a * a;
}

This square function gets called multiple times throughout the program's lifecycle. For example:

square(5);
square(1);
square(2);
square(3);

The challenge now is to track the number of times the square function is called at any given moment using square.count, which should return 4.

The solution needs to not only work for the square function but also be adaptable and applicable to other functions in the system. For instance, if there is a power(a,n) function, it should also be possible to retrieve the call count for power function with something like power.count.

Answer №1

One way to keep track of how many times a function is called is to create a wrapper function that increments a counter each time the wrapped function is invoked, like so:

function addCounter(fn) {
    const newfn = function(...args) {
        ++newfn.count;
        return fn.apply(this, args);
    };
    
    newfn.count = 0;
    
    Object.defineProperty(newfn, "length", {
        value: fn.length,
        configurable: true,
    });
    
    return newfn;
}

To apply this wrapper to a specific function, you can simply do:

square = addCounter(square);

After adding the counter, calling the function will automatically increment the count.

If you prefer not to include the length property modification, it's not commonly accessed in code. However, it's available for completeness. Just note that if another reference to the original function is kept before applying the counter wrapper, calls through that reference won't be counted. This scenario is less common but worth considering, especially with CommonJS modules where exports are copies of the original function.

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