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Expressions are usually evaluated in parameters, or in DATs containing Python Scripts, or by simply typing into the textport. We can also use the Evaluate DAT to quickly evaluate expressions – both for use in our networks, and also to check expressions before using them elsewhere in a project.
Note that in parameters that have long expressions, you can box select part of an expression, roll your cursor over the selection, and then see what that part of the longer expression evaluates to. This is good for troubleshooting your expressions.