counterII.js

//Method 1

/*
var createCounter = function(init) {
    let presentCount = init;
  
    function increment() {
      return ++presentCount;
    }
  
    function decrement() {
        return --presentCount;
    }
  
    function reset() {
        return (presentCount = init);
    }
  
    return { increment, decrement, reset };
};
*/

//Method 2


var createCounter = function(init) {
    let presentCount = init
    return {
        increment:()=> ++presentCount,
        decrement:()=> --presentCount,
        reset:()=> presentCount = init,
    }
};


//Method 3

/*
class Counter {
    constructor(init) {
      this.init = init;
      this.presentCount = init;
    }
  
    increment() {
      this.presentCount += 1;
      return this.presentCount;
    }
  
    decrement() {
      this.presentCount -= 1;
      return this.presentCount;
    }
  
    reset() {
      this.presentCount = this.init;
      return this.presentCount;
    }
  }
  
  var createCounter = function(init) {
    return new Counter(init);
};

*/