Underscore mixin to merge objects; last item takes precedence (uses _.extend not _.default)

_.merge.js

/**
 * Underscore mixin to merge objects; last item takes precedence (uses _.extend not _.default)
 **/

_.mixin({
  merge : function() {
    return _.reduce(arguments, function(list, obj){
      return _.extend(list, obj);
    }, {});
  }
});

_.merge({a: 1}, {b: 2}); // returns {a: 1, b: 2} 
_.merge({a: 1, b: 1}, {b: 2}); // returns {a: 1, b: 2} 
_.merge({a: 1, b: 1}, {a: 2}); // returns {a: 2, b: 1}