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How to tell if browser/tab is active [duplicate]
... programmatically determine the current visibility state of the page in
order to develop power and CPU efficient web applications.
Learn more (2019 update)
All modern browsers are supporting document.hidden
http://davidwalsh.name/page-visibility
https://developers.google.com/chrome/whitepaper...
Bash command to sum a column of numbers [duplicate]
... another FYI for OS X, I had to add a - at the end of the paste command in order for this to work on OS X 10.6.8.
– Clayton Stanley
Nov 9 '12 at 16:48
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What are the most common non-BMP Unicode characters in actual use? [closed]
...› GC=So DEGREE SIGN
And here now are the trans-BMP code points, in order of decending frequency:
544 U+01D49E ‹????› GC=Lu MATHEMATICAL SCRIPT CAPITAL C
450 U+01D4AF ‹????› GC=Lu MATHEMATICAL SCRIPT CAPITAL T
385 U+01D4AE ‹????› GC=Lu MATHEMATICAL SCRI...
HashMap with multiple values under the same key
...t types associated with a key. You have to take care by maintaining proper order of inserting and retrieving from Object[].
Example:
Consider, we want to store Student information. Key is id, while we would like to store name, address and email associated to the student.
//To make entry int...
Google Maps V3: How to disable “street view”?
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disableDefaultUI: true is not necessary in order to remove only the street view button.
– Eido95
Jun 4 '18 at 13:10
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How to force LINQ Sum() to return 0 while source collection is empty
... doesn't allow you to use "??" operator to set 0 for empty collection.
In order to avoid this situation you need to make LINQ expect "double?". You can do it by casting "(double?)l.Amount".
It doesn't affect the query to SQL but it makes LINQ working for empty collections.
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rsync error: failed to set times on “/foo/bar”: Operation not permitted
...ying to set an arbitrary modification time (mtime) when copying files.
In order to do this darwin's system utime() function requires that the writing process effective uid is either the same as the file uid or super user's one, see opengroup utime's page.
Check this discussion on rsync mailing list...
How can I get enum possible values in a MySQL database?
...st. You can add or change the colors in the reference table, and your sexy order forms will automatically be updated. Awesome.
Now consider the evil ENUM: how do you extract the member list? You could query the ENUM column in your table for DISTINCT values but that will only return values t...
Reset CSS display property to default value
...u have to actually append the generated element to the <body> tag in order to get the computed style, at least in Chrome.
– dimplex
Jan 7 '17 at 16:04
add a comment
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Method call if not null in C#
...ng an empty delegate ... a measurable sacrifice of both memory and time in order to save a few keystrokes? YMMV, but to me, a poor trade off.
– Bevan
May 17 '09 at 6:59
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