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What does ||= (or-equals) mean in Ruby?
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This question has been discussed so often on the Ruby mailing-lists and Ruby blogs that there are now even threads on the Ruby mailing-list whose only purpose is to collect links to all the other threads on the Ruby mailing-list that discuss this issue.
Here's one: The definitive list of ||= ...
ETag vs Header Expires
...d around but haven't been able to figure out if I should use both an ETag and an Expires Header or one or the other.
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Java logical operator short-circuiting
Which set is short-circuiting, and what exactly does it mean that the complex conditional expression is short-circuiting?
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Python: most idiomatic way to convert None to empty string?
... keeping the else, but thanks for the str(s) tip so multiple types can be handled. nice!
– Mark Harrison
Jul 1 '09 at 9:39
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Understanding REST: Verbs, error codes, and authentication
... APIs around default functions in my PHP-based web applications, databases and CMSs.
10 Answers
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What is the role of the bias in neural networks? [closed]
I'm aware of the gradient descent and the back-propagation algorithm. What I don't get is: when is using a bias important and how do you use it?
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'and' (boolean) vs '&' (bitwise) - Why difference in behavior with lists vs numpy arrays?
What explains the difference in behavior of boolean and bitwise operations on lists vs NumPy arrays?
8 Answers
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How to read the output from git diff?
The man page for git-diff is rather long, and explains many cases which don't seem to be necessary for a beginner. For example:
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Print all but the first three columns
...$(i-2)=$i; NF=NF-2; print $0}' | tr ' ' '-'
3-4-5-6-7
This is the fixed and parametrized version of larsr solution:
$ echo '1 2 3 4 5 6 7' |
awk '{for(i=n;i<=NF;i++)$(i-(n-1))=$i;NF=NF-(n-1);print $0}' n=4 | tr ' ' '-'
4-5-6-7
All other answers before Sep-2013 are nice but add extra spac...
Message Queue vs Message Bus — what are the differences?
And are there any? To me, MB knows both subscribers and publishers and acts as a mediator, notifying subscribers on new messages (effectively a "push" model). MQ, on the other hand, is more of a "pull" model, where consumers pull messages off a queue.
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