Combinator Use Case: Adding AJAX Defaults

AjaxDefaults.js

  // ...

  //AJAX DEFAULTS  
  basicAjax = addDefaults($.ajax,{
    type: "GET",
    dataType: 'json',
    contentType: 'application/json',
    error: function (jqXHR,textStatus,errorThrown) {
      /* do some default error handling */
    }
  }),
  
  //...
  
  alter = function (o,k,f) {    
    o[k] = f(o[k]);
    return o;
  },
  alterThe = curry3(counterClock(alter)),

  //...

  ajax = chain(
    //Don't forget our blessed ASP.NET virtual 
    //path which changes all the friggin time
    alterThe('url',function(u){
      return util.virt(u);
    }),
    //Or simply:
    //alterThe('url',util.virt),
    basicAjax
  ),
  
  //...

We can use simple combinators to add default arguments to functions which take single objects as argument collections, or later, we can use simple combinators to alter the functionality of our functions by prefixing argument-object mutators.