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When to use Declarative Expressions

Updated on September 13, 2021

This presentation is part of the Declarative Expressions Self-Study Course.


To decide whether to use declarative or procedural rules to do your calculations, follow these guidelines.

Use declarative rules when rules need to be executed:

  • All the time
  • Not well defined (i.e., no one can say that the rule will only need to be executed at specific times)
  • Only when the input data changes
  • Only when the stored result of the rule is used

Use procedural rules when rules need to be executed:

  • At well defined intervals
  • You need control of when a rule is fired


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