September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd Edition
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Trapping an Exception with try…catch
If you’re familiar with Java, then you’ll have no difficulties understanding the try…catch expression. Java can trap an exception with the following syntax:
| | try { |
| | block |
| | } catch (exception type identifier) { |
| | block |
| | } catch (exception type identifier) { |
| | block |
| | } ... |
| | finally { |
| | block |
| | } |
Erlang has a remarkably similar construct, which looks like this:
| | try FuncOrExpressionSeq of |
| | Pattern1 [when Guard1] -> Expressions1; |
| | Pattern2 [when Guard2] -> Expressions2; |
| | ... |
| | catch |
| | ExceptionType1: ExPattern1 [when ExGuard1] -> ExExpressions1; |
| | ExceptionType2: ExPattern2 [when ExGuard2] -> ExExpressions2; |
| | ... |
| | after |
| | AfterExpressions |
| | end |
try…catch Has a Value
Remember, ...
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