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var once = (function() {
  var didRun = false;

  // This function will be executed only once, no matter how many times
  // it is called.
  function once() {
    // ...
  }

  return function() {
    if (didRun) {
      return;
    }

    didRun = true;

    return foo.apply(this, arguments);
  }
})();