closure-with-private-data.coffee

# From http://nathansjslessons.appspot.com/lesson?id=1080

counter = ( ->
  count = 0 # cannot be accessed as it's tied to the closure
  f = ->
    count += 1
  f
)()

console.log counter() # 1
console.log counter() # 2
console.log counter() # 3
console.log counter() # 4

output.js

var counter;
counter = (function() {
  var count, f;
  count = 0;
  f = function() {
    return count += 1;
  };
  return f;
})();

console.log(counter());
console.log(counter());
console.log(counter());
console.log(counter());