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What happens to a declared, uninitialized variable in C? Does it have a value?
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In practice, they tend to just have some nonsensical value in there initially - some compilers may even put in specific, fixed values to make it obvious when looking in a debugger - but strictly speaking, the compiler is free to do anything from crashing to summoning demons through your nasal pass...
How to scroll the window using JQuery $.scrollTo() function
...ml, body') just like Tim has pointed here. Just $('body') will not work in all browsers.
– i--
Mar 28 '13 at 21:28
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How can I verify if one list is a subset of another?
I need to verify if a list is a subset of another - a boolean return is all I seek.
15 Answers
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How to access the last value in a vector?
...s not from an aesthetical but performance-oriented point of view, I've put all of the above suggestions through a benchmark. To be precise, I've considered the suggestions
x[length(x)]
mylast(x), where mylast is a C++ function implemented through Rcpp,
tail(x, n=1)
dplyr::last(x)
x[end(x)[1]]]
rev...
What's the difference between disabled=“disabled” and readonly=“readonly” for HTML form input fields
...or disabled form elements are not passed to the processor method. The W3C calls this a successful element.(This works similar to
form check boxes that are not checked.)
Some browsers may override or provide default styling for disabled form elements. (Gray out or emboss text) Internet Explorer
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How to use concerns in Rails 4
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So I found it out by myself. It is actually a pretty simple but powerful concept. It has to do with code reuse as in the example below. Basically, the idea is to extract common and / or context specific chunks of code in order to clean up the models and avoid them...
Difference between CC, gcc and g++?
...tform-specific, is the meaning of 'CC' (and 'cc').
On Solaris, CC is normally the name of the Sun C++ compiler.
On Solaris, cc is normally the name of the Sun C compiler.
On Linux, if it exists, CC is probably a link to g++.
On Linux, cc is a link to gcc.
However, even on Solaris, it could be th...
How to check if a variable is set in Bash?
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(Usually) The right way
if [ -z ${var+x} ]; then echo "var is unset"; else echo "var is set to '$var'"; fi
where ${var+x} is a parameter expansion which evaluates to nothing if var is unset, and substitutes the string x otherw...
How do I reflect over the members of dynamic object?
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In the case of ExpandoObject, the ExpandoObject class actually implements IDictionary<string, object> for its properties, so the solution is as trivial as casting:
IDictionary<string, object> propertyValues = (IDictionary<string, object>)s;
Note that this will n...
Is unsigned integer subtraction defined behavior?
... not restricted to overflow of the upper bound of the type, and applies equally to values too low to be represented.
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