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Environment variable substitution in sed
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What if the string contains a \ followed by an n - how to stop sed from converting that into a single newline character?
– Max Waterman
Jul 24 at 9:58
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How to find reason of failed Build without any error or warning
...gering any error message in the normal place.
I was able to determine this by setting the "MSBuild project build output verbosity" (in the latest Visual Studio's Tools tab [Path: Tools > Options > Build and Run]) to "Diagnostic" as shown below. This then showed that the custom action (in my ca...
Get JSON object from URL
...ents requires that allow_url_fopen is enabled. This can be done at runtime by including:
ini_set("allow_url_fopen", 1);
You can also use curl to get the url. To use curl, you can use the example found here:
$ch = curl_init();
// IMPORTANT: the below line is a security risk, read https://paragoni...
What is the argument for printf that formats a long?
...e as -1. Should be printf("%lu", ULONG_MAX) for unsigned long as described by @Blorgbeard below.
– jammus
Nov 12 '11 at 16:03
2
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How to check null objects in jQuery
... FAQ...
You can use the length property of the jQuery collection returned by your selector:
if ( $('#myDiv').length ){}
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Eclipse / Android : “Errors running builder 'Android Pre Compiler' on project…”
...swered Jan 22 '13 at 11:23
Mick ByrneMick Byrne
13.3k1313 gold badges6767 silver badges8383 bronze badges
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Rebuild or regenerate 'ic_launcher.png' from images in Android Studio
... click on res folder > New image asset
browser to the icon. Click next
By default the icon goes to src/debug/res- keep this
In the project hierarchy, browse to src/debug/res and copy the files from the drawable*
directories to the same directories in src/main and src/main
copy the src/debug/res...
event Action vs event EventHandler
... know and love : )
You can customize the code for the add/remove handlers by changing the scope of the FireNiceEvent delegate to protected. This now allows developers to add custom hooks to the hooks, such as logging or security hooks. This really makes for some very powerful features that now allo...
Convert columns to string in Pandas
...', 'b', 'c'], dtype="string")
s.dtype
# StringDtype
Here's why, as quoted by the docs:
You can accidentally store a mixture of strings and non-strings in an object dtype array. It’s better to have a dedicated dtype.
object dtype breaks dtype-specific operations like DataFrame.select_dtypes(). ...
Rake just one migration
...heck the timestamps (Migration ID) for the previous migrations you've done by using
rake db:migrate:status
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