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Remove blank lines with grep
I tried grep -v '^$' in Linux and that didn't work. This file came from a Windows file system.
14 Answers
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NoSQL (MongoDB) vs Lucene (or Solr) as your database
...e my lessons learned:
You can easily use Lucene/Solr in lieu of MongoDB for pretty much all situations, but not vice versa. Grant Ingersoll's post sums it up here.
MongoDB etc. seem to serve a purpose where there is no requirement of searching and/or faceting. It appears to be a simpler and arguab...
Does const mean thread-safe in C++11?
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Two expression evaluations conflict if one of them modifies a memory location (1.7) and the other one accesses or modifies the same memory location.
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The execution of a program contains a data race if it contains two conflicting actions in different threads, at least one of which ...
Mimicking sets in JavaScript?
I'm working in JavaScript. I'd like to store a list of unique , unordered string values, with the following properties:
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What are the different usecases of PNG vs. GIF vs. JPEG vs. SVG?
When should certain image file types be used when building websites or interfaces, etc?
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How to solve PHP error 'Notice: Array to string conversion in…'
I have a PHP file that tries to echo a $_POST and I get an error, here is the code:
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Why do most fields (class members) in Android tutorial start with `m`?
...t camel case rules, but I'm confused with this m rule. What does it stand for? I'm a PHP developer. "We" use first letters of variables as indication of type, like 'b' for boolean, 'i' for integer and so on.
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Should I always return IEnumerable instead of IList?
When I'm writing my DAL or other code that returns a set of items, should I always make my return statement:
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What is a Shim?
...pts an API, changing the parameters passed, handling the operation itself, or redirecting the operation elsewhere. Shims typically come about when the behaviour of an API changes, thereby causing compatibility issues for older applications that still rely on the older functionality. In these cases, ...
Find the max of two or more columns with pandas
...a dataframe with columns A , B . I need to create a column C such that for every record / row:
2 Answers
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