Closure Example

Example of a closure

var scoreCounter = (function() {
  var score = 0;
  return {
    incrementBy: function(a) {
      score+=a;
    },
    decrementBy: function(b) {
      score-=b;
    },
    getValue: function() {
      return score;
    }
  };   
})();

console.log(scoreCounter.getValue()); // logs 0scoreCounter.incrementBy(10);
scoreCounter.incrementBy(5);
console.log(scoreCounter.getValue()); // logs 15scoreCounter.decrementBy(2);
console.log(scoreCounter.getValue()); // logs 13