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    function myFunc( args ) {
      var defaults = {
        optionalA: 'Some default',
        optionalB: 'Another default',
        optionalC: 'Some other default'
      };
      args = $.extend({}, defaults, args);
      console.log(args.optionalA, args.optionalB, args.optionalC);
    }
    
    // example using it
    myFunc({
      optionalA: "We'll override optionalA and optionalC...",
      optionalC: "...leaving optionalB to use its default."
    });
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