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How to randomly pick an element from an array
...me you run the function: the random generator is supposed to have history. If it haven't, it's extremely predictable. It's not a problem at all in this case — but it should be mentioned that array[(int)(System.currentTimeMillis() % array.length)] is just as good as the proposed solution.
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How may I reference the script tag that loaded the currently-executing script?
...t;/script>
Benefits
Simple and explicit. Reliable.
Don't need to modify the script tag
Works with asynchronous scripts (defer & async)
Works with scripts inserted dynamically
Problems
Will not work in older browsers and IE.
Does not work with modules <script type="module">
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Android - implementing startForeground for a service?
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I'd start by completely filling in the Notification. Here is a sample project demonstrating the use of startForeground().
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Correct way to define Python source code encoding
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Check the docs here:
"If a comment in the first or second line of the Python script matches the regular expression coding[=:]\s*([-\w.]+), this comment is processed as an encoding declaration"
"The recommended forms of this expression are
# -*- ...
Getting an “ambiguous redirect” error
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Bash can be pretty obtuse sometimes.
The following commands all return different error messages for basically the same error:
$ echo hello >
bash: syntax error near unexpected token `newline`
$ echo hello > ${NONEXISTENT}
bash: ${NONEXISTENT}: ambiguous redirect
$ echo hello > "${NONE...
Get original URL referer with PHP?
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Store it either in a cookie (if it's acceptable for your situation), or in a session variable.
session_start();
if ( !isset( $_SESSION["origURL"] ) )
$_SESSION["origURL"] = $_SERVER["HTTP_REFERER"];
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Is it possible to break a long line to multiple lines in Python [duplicate]
...e C, you can break a long line into multiple short lines. But in Python , if I do this, there will be an indent error... Is it possible?
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Java rounding up to an int using Math.ceil
...1
int n = a / b + ((a % b == 0) ? 0 : 1);
You do a / b with always floor if a and b are both integers. Then you have an inline if-statement witch checks whether or not you should ceil instead of floor. So +1 or +0, if there is a remainder with the division you need +1. a % b == 0 checks for the re...
How to list only top level directories in Python?
...to get the real path):
>>> [ name for name in os.listdir(thedir) if os.path.isdir(os.path.join(thedir, name)) ]
['ctypes', 'distutils', 'encodings', 'lib-tk', 'config', 'idlelib', 'xml', 'bsddb', 'hotshot', 'logging', 'doc', 'test', 'compiler', 'curses', 'site-packages', 'email', 'sqlite3'...
Get ID of last inserted document in a mongoDB w/ Java driver
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It's safe to do
doc.set("_id", new ObjectId())
if you look at driver code
if ( ensureID && id == null ){
id = ObjectId.get();
jo.put( "_id" , id );
}
public static ObjectId get(){
return new ObjectId();
}
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