Evaluation Environment
When an expression is evaluated in Iotellect, there are a number of parameters that may affect the result. The whole set of these parameters is called "evaluation environment". Most of these parameters affect the resolution of references that may appear inside the expression, as well as operation of context-related functions.
Evaluation environment includes:
Default Context | The default context that is used to resolve relative context paths that may appear in standard references. |
Default Data Table | The default data table that is used to resolve standard references that do not explicitly point to variable/function of a certain context. |
Default Row | The default row that is used to determine what data table row should be accessed when resolving standard references that do not explicitly specify a row. |
Environment Variables | Any environment variables that may be retrieved by using environment references inside the expression. |
Backend and Frontend Evaluation
Most expressions are evaluated “inside” an Iotellect Server (backend-side evaluation). However in certain cases, for example for Data Table bindings working inside the Web UI, expressions may be evaluated in a web browser (frontend-side evaluation).
Backend and frontend expression processing is identical in almost all aspects. However, there are still some minor differences (for example, in the set of supported functions and their parameters). All such differences are described here in the documentation.
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