Recipe 2.11: Creating 'Memoized' Attributes and Methods

Last Updated: Sep 8, 2003 Status: Draft

Problem:  

You want to create an attribute or method that will be initialized (possibly using a very complex, time-consuming algorithm) the first time it is used, but thereafter uses the initialized, cached value.

Solution:  

Use the is once property:

method foo is once { ... }

Discussion:

Issue: Other possible keyword choices include is cached or is memoized.

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