Vfrdtyky

I'm a beginner with JavaScript so please be patient =)

I am trying to write a function that counts the number of times it is called. What I have so far is a function with a counter that is incremented explicitly:

var increment = function () {

    var i = 0;

    this.inc = function () {i += 1;};

    this.get = function () {return i;};

};



var ob = new increment();

ob.inc();

ob.inc();

alert(ob.get());

But I'm wondering how to call only ob();, so the function could increment calls made to itself automatically. Is this possible and if so, how?

var increment = function() {

    var i = 0;

    return function() { return i += 1; };

};



var ob = increment();

ob = function (){  

  ++ob.i || (ob.i=1);

  return ob.i; 

}

Wrap a counter to any function:

/**

 * Wrap a counter to a function

 * Count how many times a function is called

 * @param {Function} fn Function to count

 * @param {Number} count Counter, default to 1

 */

function addCounterToFn(fn, count = 1) {

  return function () {

    fn.apply(null, arguments);

    return count++;

  }

}

See https://jsfiddle.net/n50eszwm/