CocoRoboDesktop/pdf1.js/node_modules/underscore/amd/tap.js

define(function () {

  // Invokes `interceptor` with the `obj` and then returns `obj`.
  // The primary purpose of this method is to "tap into" a method chain, in
  // order to perform operations on intermediate results within the chain.
  function tap(obj, interceptor) {
    interceptor(obj);
    return obj;
  }

  return tap;

});