Add a variable to a class instance at runtime: Difference between revisions
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(update task description to indicate that the instance being modified must be an "object" instance and must not itself be a class) |
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{{task|Object oriented}} |
{{task|Object oriented}} |
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Demonstrate how to dynamically add variables to a class instance at runtime. |
Demonstrate how to dynamically add variables to an object (a class instance) at runtime. |
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This is useful when the methods/variables of an instance are based on a data file that isn't available until runtime. Hal Fulton gives an example of creating an OO CSV parser at [http://www.devsource.com/article2/0,1759,1928562,00.asp An Exercise in Metaprogramming with Ruby]. This is referred to as "monkeypatching" by Pythonistas and some others. |
This is useful when the methods/variables of an instance are based on a data file that isn't available until runtime. Hal Fulton gives an example of creating an OO CSV parser at [http://www.devsource.com/article2/0,1759,1928562,00.asp An Exercise in Metaprogramming with Ruby]. This is referred to as "monkeypatching" by Pythonistas and some others. |
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