September 2013
Intermediate to advanced
548 pages
12h 25m
English
Content preview from Programming Erlang, 2nd EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Fail Fast and Noisily, Fail Politely
We need to consider two key principles when coding for errors. First, we should fail as soon as an error occurs, and we should fail noisily. Several programming languages adopt the principle of failing silently, trying to fix up the error and continuing; this results in code that is a nightmare to debug. In Erlang, when an error is detected internally by the system or is detected by program logic, the correct approach is to crash immediately and generate a meaningful error message. We crash immediately so as not to make matters worse. The error message should be written to a permanent error log and be sufficiently detailed so that we can figure out what went wrong later.
Second, fail politely means that ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.