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How do I check for null values in JavaScript?

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How to get a vertical geom_vline to an x-axis of class date?

...I have a time series from and would like to draw a vertical line for years 1998, 2005 and 2010 for example. I tried with ggplot and qplot syntax, but still I either see no vertical line at all or the vertical line is drawn at the very first vertical grid and the whole series is shifted somewhat ...
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ConnectionTimeout versus SocketTimeout

...ctions where data is received all the time. By setting socket timeout to 1 this would require that every millisecond new data is received (assuming that you read the data block wise and the block is large enough)! If only the incoming stream stalls for more than a millisecond you are running int...
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How can I find the last element in a List?

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Android - drawable with rounded corners at the top only

... 316 Try giving these values: <corners android:topLeftRadius="6dp" android:topRightRadius="6dp"...
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How to convert number to words in java

... 107 Here is the code, I don't think there is any method in SE. It basically converts number to st...
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Least common multiple for 3 or more numbers

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How can I filter a date of a DateTimeField in Django?

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Fast check for NaN in NumPy

... 162 Ray's solution is good. However, on my machine it is about 2.5x faster to use numpy.sum in pla...
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jQuery .val change doesn't change input value

... 180 Use attr instead. $('#link').attr('value', 'new value'); demo ...