Using exceptions
Exceptions are one of the mechanisms that we can use in Scala to handle error scenarios. It consists of two statements:
- The
throw exceptionObjectstatement stops the current function and passes the exception up to the caller. - The
try { myFunc() } catch { case pattern1 => recoverExpr1 }statement catches any exception thrown bymyFunc()if the exception matches one of the patterns inside thecatchblock: - If an exception is thrown by
myFunc, but no pattern matches the exception, the function stops, and the exception is passed up to the caller again. If there is notry...catchblock in the call chain that can catch the exception, the whole program stops. - If an exception is thrown by
myFunc, and thepattern1pattern matches the exception, thetry...catchblock will return therecoverExpr1expression at the right of the arrow. - If no exception is thrown, the
try...catchblock returns the result returned bymyFunc().
This mechanism comes from Java, and since the Scala SDK sits on...
