wrapping_example.js

// replacing a function with a one-time suppression using _.wrap
var module = {
  execute: function(target) {
    doSomeBigAction(target);
  }
};

// it might be more clear if I assign this intermediate variable
var skipOnce = _(module.execute).wrap(function(original) {
  console.log("Sorry, doing nothing this time.");
  module.execute = original;
});

module.execute = skipOnce; // replace existing execute method

module.execute(command); // nothing happens
module.execute(command); // does the action

// altering a function using _.wrap
module.execute = _(module.execute).wrap(function(original, target) {
  original(target);
  additionalActions(target);
  /* Does not change itself back; though you can see how it would
   * be possible to change itself back conditionally or something.
   */
});