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Checking if a key exists in a JavaScript object?
...r, if you want to particularly test for properties of the object instance (and not inherited properties), use hasOwnProperty:
obj.hasOwnProperty("key") // true
For performance comparison between the methods that are in, hasOwnProperty and key is undefined, see this benchmark
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Concept of void pointer in C programming
... is there is any way of generalizing a function which can receive pointer and store it in void pointer and by using that void pointer we can make a generalized function..
You cannot just dereference it in a portable way, as it may not be properly aligned. It may be an issue on some architectures ...
Getting LaTeX into R Plots
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As stolen from here, the following command correctly uses LaTeX to draw the title:
plot(1, main=expression(beta[1]))
See ?plotmath for more details.
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im...
Using OpenGl with C#? [closed]
Is there free OpenGL support libraries for C#? If so, which one do I use and where do I find sample projects?
9 Answers
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Python super() raises TypeError
...od me . Triptych . I remember I was using a python version less than 3.0 , and I didn't specifically said that my class inherits from Object , and the call to super worked . Maybe it's default behaviour from 2.6 ? Just saying :)
– Geo
Jan 28 '09 at 20:55
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Margin while printing html page
... am using a separate style-sheet for printing. Is it possible to set right and left margin in the style-sheet which set the print margin (i.e. margin on paper).
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Input type=password, don't let browser remember the password
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You can also deliver the page with HTTPS and via HTTP header or META tag prevent caching. That way, the password also won't be stored (at least in Internet Explorer).
– doekman
Apr 9 '10 at 8:55
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Convert UTC/GMT time to local time
...012-09-19 01:27:30.000, DateTime.Parse cannot tell what time zone the date and time are from.
DateTime has a Kind property, which can have one of three time zone options:
Unspecified
Local
Utc
NOTE If you are wishing to represent a date/time other than UTC or your local time zone, then you shou...
How to make the first option of selected with jQuery
...swered Sep 12 '09 at 4:31
David AndresDavid Andres
28.8k77 gold badges4141 silver badges3535 bronze badges
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Having both a Created and Last Updated timestamp columns in MySQL 4.0
...possible to have the current timestamp be the default value for one column and the auto-update value for another column.
Changes in MySQL 5.6.5:
Previously, at most one TIMESTAMP column per table could be automatically initialized or updated to the current date and time. This restriction has b...