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Why does String.valueOf(null) throw a NullPointerException?
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203
The issue is that String.valueOf method is overloaded:
String.valueOf(Object)
String.valueOf(c...
Actual meaning of 'shell=True' in subprocess
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answered Jul 3 '10 at 18:46
Heath HunnicuttHeath Hunnicutt
16.3k22 gold badges3535 silver badges5858 bronze badges
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Adding additional data to select options using jQuery
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323
HTML Markup
<select id="select">
<option value="1" data-foo="dogs">this</opt...
Python “raise from” usage
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edited Jul 7 '19 at 23:56
answered Jul 15 '14 at 7:44
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Passing arguments to C# generic new() of templated type
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JaredParJaredPar
648k133133 gold badges11601160 silver badges13951395 bronze badges
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R object identification
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data(cars)
obj <- lm(dist ~ speed, data=cars)
..etc.
If obj is an S3 or S4 object, you can also try methods or showMethods, showClass, etc. Patrick Burns' R Inferno has a pretty good section on this (sec #7).
EDIT: Dirk and Hadley mention str(obj) in their answers. It really is much bette...
How can I do division with variables in a Linux shell?
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edited Aug 7 '13 at 3:04
answered Aug 7 '13 at 2:59
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How to loop through an associative array and get the key? [duplicate]
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340
You can do:
foreach ($arr as $key => $value) {
echo $key;
}
As described in PHP docs.
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Size of character ('a') in C/C++
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354
In C, the type of a character constant like 'a' is actually an int, with size of 4 (or some ot...
How to Diff between local uncommitted changes and origin
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135
Given that the remote repository has been cached via git fetch it should be possible to compare...