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How do I negate a test with regular expressions in a bash script?
...-suse-linux-gnu), I would like to negate a test with Regular Expressions. For example, I would like to conditionally add a path to the PATH variable, if the path is not already there, as in:
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SignalR: Why choose Hub vs. Persistent Connection?
...tent connections.
From the highly up-voted comment below:
Partially correct. You can get topics or groups in persistent connections as well. The big difference is dispatching different types of messages. For example you have different kinds of messages and you want to send different kinds of p...
How do I delete an item or object from an array using ng-click?
...son this is undefined. Plunker/jsfiddle perhaps?
– Tjorriemorrie
Sep 19 '13 at 10:59
11
.indexOf(...
How to declare std::unique_ptr and what is the use of it?
I try to understand how std::unique_ptr works and for that I found this document. The author starts from the following example:
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Should try…catch go inside or outside a loop?
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PERFORMANCE:
There is absolutely no performance difference in where the try/catch structures are placed. Internally, they are implemented as a code-range table in a structure that is created when the method is called. While the ...
Django CharField vs TextField
...) in Django? The documentation says that CharField() should be used for smaller strings and TextField() should be used for larger strings. Okay, but where is the line drawn between "small" and "large"? What's going on under the hood here that makes this the case?
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How to use OpenSSL to encrypt/decrypt files?
I want to crypt and decrypt one file using one password.
10 Answers
10
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Is it fine to have foreign key as primary key?
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Foreign keys are almost always "Allow Duplicates," which would make them unsuitable as Primary Keys.
Instead, find a field that uniquely identifies each record in the table, or add a new field (either an auto-incrementing int...
can't push to branch after rebase
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First, you and those you're working with need to agree whether a topic/devel branch is for shared development or just your own. Other developers know not to merge on my development branches because they'll be rebased at any time. Usually the workflow is ...
Python List vs. Array - when to use?
If you are creating a 1d array, you can implement it as a List, or else use the 'array' module in the standard library. I have always used Lists for 1d arrays.
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