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BUILT-IN MATHEMATICA SYMBOL
Check
Check[expr, failexpr]
evaluates expr, and returns the result, unless messages were generated, in which case it evaluates and returns failexpr.
Check[expr, failexpr, {s1::t1, s2::t2, ...}]
checks only for the specified messages.
Check[expr, failexpr, "name"]
checks only for messages in the named message group.
Details
- Check has attribute HoldAll.
- Check does not test for messages that have been switched off using Off, or by uses of Quiet that occur inside it.
- The operation of Check is not affected by being enclosed inside Quiet.
- In Check[expr, failexrp, "name"], possible named message groups are given by $MessageGroups.
- Explicit message names of the form
can be mixed with named message groups.
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