[Couchdb Wiki] Update of "Introduction to CouchDB views" by TimSomers

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The following page has been changed by TimSomers:
http://wiki.apache.org/couchdb/Introduction_to_CouchDB_views

The comment on the change is:
I'm using eval(uneval(obj)) to create a clone, anyone know a cleaner solution?

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  }}}
  
  ''This example output was reformatted for readability.''
+ 
+ Keep in mind that emit works by just storing the key/value pairs in an array and then, when all views in the same _design document have been calculated, returns all results at once. So if you use an object to make calculations and do multiple emits on the same document, you must create a copy and not emit the same object multiple times. For example:
+ 
+ {{{
+ function(doc) {
+   if (doc.Type == "measurement") {
+     var timestamp = new Date(doc.timestamp)
+     emit(eval(uneval(timestamp)), doc.lastTemp);
+     timestamp.setSeconds(timestamp.getSeconds - 30);
+     emit(eval(uneval(timestamp)), doc.temp30secsAgo);
+     timestamp.setSeconds(timestamp.getSeconds - 30);
+     emit(eval(uneval(timestamp)), doc.temp1minAgo);
+   }
+ }
+ }}}
  
  === Reduce Functions ===