gist: 44308


  
    
      JavaScript #
    
    
      
      
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              Object.extend = Object.extend.wrap(function(proceed, destination, source, safe) {
  if (!safe) return proceed(destination, source);
  for (var property in source) {
    if (!(property in destination))
      destination[property] = source[property]; 
  }
  return destination;
});
 
Object.extend({foo: 123}, {foo: 456}, true).foo
// -> 123
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