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What is the difference between null and undefined in JavaScript?
...he typeof operator returns 'object' for a value that is null. This was actually an error in the original JavaScript implementation that was then copied in ECMAScript. Today, it is rationalized that null is considered a placeholder for an object, even though, technically, it is a primitive value."
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google chrome extension :: console.log() from background page?
If I call console.log('something'); from the popup page, or any script included off that it works fine.
11 Answers
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Can an Android NFC phone act as an NFC tag?
... a simple old nfc tag? Is there some application I'm not thinking of? Usually, you'd want to emulate something like a transit card, access key, or credit card which would require a secure element (I think, but not sure).
s...
What is the best practice for dealing with passwords in git repositories?
...he password info from a configuration file. If your configuration file is called foobar.config, then you would commit a file called foobar.config.example to the repository, containing sample data. To run your program, you would create a local (not tracked) file called foobar.config with your real pa...
how to use python to execute a curl command
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It seems there's a small typo in the headers, which should read 'Accept-Charset': 'UTF-8'
– Stephen Lead
Feb 4 '16 at 2:25
1
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jQuery table sort
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If you want to avoid all the bells and whistles then may I suggest this simple sortElements plugin. Usage:
var table = $('table');
$('.sortable th')
.wrapInner('<span title="sort this column"/>')
.each(function(){
var th ...
HTML5 Canvas vs. SVG vs. div
...rs.
Canvas has the best performance hands-down, but you have to implement all concepts of managed state (object selection, etc) yourself, or use a library.
The long answer:
HTML5 Canvas is simply a drawing surface for a bit-map. You set up to draw (Say with a color and line thickness), draw tha...
How to make an introduction page with Doxygen
...tation - very useful for documentation that is necessary but that is not really appropriate to include with your source code (for example, an FAQ)
So I would recommend having a mainpage.dox (or similarly named) file in your project directory to introduce you SDK. Note that inside this file you need...
How do I format a number in Java?
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Actually, String.format is like C's printf. It can format several kinds of data types.
– cesarse
Jul 2 '13 at 13:36
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How can I SELECT rows with MAX(Column value), DISTINCT by another column in SQL?
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You are so close! All you need to do is select BOTH the home and its max date time, then join back to the topten table on BOTH fields:
SELECT tt.*
FROM topten tt
INNER JOIN
(SELECT home, MAX(datetime) AS MaxDateTime
FROM topten
GR...