Catch
 Usage
• Catch[expr] returns the argument of the first Throw generated in the evaluation of expr.
• Catch[expr, form] returns value from the first Throw[value, tag] for which form matches tag.
• Catch[expr, form, f] returns f[value, tag].
Notes
• Catch[expr, ... ] always returns the value of expr if no Throw was generated during the evaluation. • form can be any expression, and is often a pattern. • tag in Throw[value, tag] is re-evaluated every time it is compared to form. • New in Version 1; modified in 3.
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