A super simple example of a function closure in JavaScript. The example shows how to increment a private property within a function closure.

functionClosure.js

result = (function () {
  var result = 0;

  return {
    value: function() {
      return value;
    },
    
    increment: function() {
      return ++value;
    }
  };
}());

//call result.value() //output: value = 0
//call result.increment(); 
//call result.value() //output: value = 1