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Dictionaries and default values
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@Jens: Function calls are expensive.
– Tim Pietzcker
Mar 13 '15 at 21:35
1
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Merge/flatten an array of arrays
...t modify the source array, so the merged array will remain empty after the call to concat. Better to say something like: merged = merged.concat.apply(merged, arrays);
– Nate
Jan 24 '13 at 21:12
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HTTP error 403 in Python 3 Web Scraping
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I assume it's safe to reuse req for multiple urlopen calls.
– Acumenus
Feb 2 '19 at 0:28
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Html.Partial vs Html.RenderPartial & Html.Action vs Html.RenderAction
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Html.Partial returns a String. Html.RenderPartial calls Write internally and returns void.
The basic usage is:
// Razor syntax
@Html.Partial("ViewName")
@{ Html.RenderPartial("ViewName"); }
// WebView syntax
<%: Html.Partial("ViewName") %>
<% Html.RenderPartial(...
How do you build a Singleton in Dart?
.... There's the weird syntax Singleton._internal(); that looks like a method call when it's really a constructor definition. There's the _internal name. And there's the nifty language design point that Dart lets you start out (dart out?) using an ordinary constructor and then, if needed, change it to ...
How to prevent SIGPIPEs (or handle them properly)
...he following code:
signal(SIGPIPE, SIG_IGN);
If you're using the send() call, another option is to use the MSG_NOSIGNAL option, which will turn the SIGPIPE behavior off on a per call basis. Note that not all operating systems support the MSG_NOSIGNAL flag.
Lastly, you may also want to consider ...
How to properly add cross-site request forgery (CSRF) token using PHP
...ecurity code, please don't generate your tokens this way: $token = md5(uniqid(rand(), TRUE));
rand() is predictable
uniqid() only adds up to 29 bits of entropy
md5() doesn't add entropy, it just mixes it deterministically
Try this out:
Generating a CSRF Token
PHP 7
session_start();
if (empty(...
Using DISTINCT and COUNT together in a MySQL Query
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use
SELECT COUNT(DISTINCT productId) from table_name WHERE keyword='$keyword'
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When to call activity context OR application context?
... Context from getApplicationContext() holds onto something created by your calls on it that you don't clean up. With an Activity, if it holds onto something, once the Activity gets garbage collected, everything else flushes out too. The Application object remains for the lifetime of your process.
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How to define custom exception class in Java, the easiest way?
...onstructors, you need to define the one taking a String in your class. Typically you use super(message) in your constructor to invoke your parent constructor. For example, like this:
public class MyException extends Exception {
public MyException(String message) {
super(message);
}
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