added optional apporach

Author: Cerem Cem ASLAN

doc/Ractive/temporary-variables-inside-each-loop.md

@@ -8,6 +8,17 @@
             {{/with}}
         {{/each}}
 
-`myobj` is not polluted with the `tmp` variables. 
+`myobj` is not polluted by the `tmp` variables. 
 
-(see https://gitter.im/ractivejs/ractive?at=5f3decae33878e7e602e58d7)
+(see https://gitter.im/ractivejs/ractive?at=5f3decae33878e7e602e58d7)
+
+> If you prefer to fill your original object permanently with the generated values, 
+> use `{{@context.set()}}`: 
+> 
+>        {{#each myobj}}
+>            {{@context.set('.tmp', (.foo !== 'bar')) && ''}}
+>
+>            <!-- attention to the dot in front of variable -->
+>            <li>{{.hello}} tmp is: {{.tmp}}</li>  
+>
+>        {{/each}}