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Re:Default Parameters in JavaScript by insin on Tuesday March 19, 2013 @11:29AM (#5401439)
TL;DR version:

    function(kwargs) {
      kwargs = _.extend({param1: true, param2: 42}, kwargs)
      // ...
    }
Re:Default Parameters in JavaScript by masklinn on Tuesday March 19, 2013 @01:39PM (#5402371)

    var args = _.defaults({}, kwargs, {param1: true, param2: 42}).