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Filename : before.js

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define(function () {

  // Returns a function that will only be executed up to (but not including) the
  // Nth call.
  function before(times, func) {
    var memo;
    return function() {
      if (--times > 0) {
        memo = func.apply(this, arguments);
      }
      if (times <= 1) func = null;
      return memo;
    };
  }

  return before;

});