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Understanding exactly when a data.table is a reference to (vs a copy of) another data.table
...ing the pass-by-reference properties of data.table . Some operations seem to 'break' the reference, and I'd like to understand exactly what's happening.
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How to get the Android device's primary e-mail address
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There are several ways to do this, shown below.
As a friendly warning, be careful and up-front to the user when dealing with account, profile, and contact data. If you misuse a user's email address or other personal information, bad things can hap...
Serializing a list to JSON
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If using .Net Core 3.0 or later;
Default to using the built in System.Text.Json parser implementation.
e.g.
using System.Text.Json;
var json = JsonSerializer.Serialize(aList);
alternatively, other, less mainstream options are available like Utf8Json parser and ...
Minimizing NExpectation for a custom distribution in Mathematica
This relates to an earlier question from back in June:
1 Answer
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How to hide iOS status bar
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You should add this value to plist: "View controller-based status bar appearance" and set it to "NO".
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How to var_dump variables in twig templates?
...here a "list all defined variables" functionality in TWIG? Is there a way to dump a variable?
14 Answers
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Generate list of all possible permutations of a string
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There are several ways to do this. Common methods use recursion, memoization, or dynamic programming. The basic idea is that you produce a list of all strings of length 1, then in each iteration, for all strings produced in the last iteration, add ...
Way to get number of digits in an int?
...ed solution is perfectly OK, there is nothing "un-neat" about it. You have to realize that mathematically, numbers don't have a length, nor do they have digits. Length and digits are both properties of a physical representation of a number in a specific base, i.e. a String.
A logarithm-based soluti...
How to deny access to a file in .htaccess
...in an htaccess file, the scope of the <Files> directive only applies to that directory (I guess to avoid confusion when rules/directives in the htaccess of subdirectories get applied superceding ones from the parent).
So you can have:
<Files "log.txt">
Order Allow,Deny
Deny from ...
Solr vs. ElasticSearch [closed]
...g the most important aspects:
Bob Yoplait already linked kimchy's answer to ElasticSearch, Sphinx, Lucene, Solr, Xapian. Which fits for which usage?, which summarizes the reasons why he went ahead and created ElasticSearch, which in his opinion provides a much superior distributed model and ease o...