Add a variable to a class instance at runtime: Difference between revisions

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 =={{header|J}}==
+If you assign a value to the name which references a property of a class instance, that name within that instance gets that value.
-Simple assignment will add variables to classes.
-<lang j>   C=:<'exampleclass'
+<lang j>   C=:<'exampleclass'         NB. this will be our class name
+   V__C=: 0                   NB. ensure the class exists
-   V__C=: 0
-   OBJ=:conew 'exampleclass'
+   OBJ1=:conew 'exampleclass' NB. create an instance of our class
+   OBJ2=:conew 'exampleclass' NB. create another instance
-   V__OBJ
+   V__OBJ1,V__OBJ2            NB. both of our instances exist
+   W__OBJ1                    NB. instance does not have a W
-   W__C
 |value error
+   W__OBJ1=: 0                NB. here, we add a W to this instance
-   W__C=: 0
+   W__OBJ1                    NB. this instance now has a W
-   W__OBJ
-</lang>
+   W__OBJ2                    NB. our other instance does not
+|value error</lang>
 =={{header|JavaScript}}==