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Why does one often see “null != variable” instead of “variable != null” in C#?
...m in the ways of modern languages, and suggest they write the more natural form in future.
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Why can't Python find shared objects that are in directories in sys.path?
...udes /usr/local/lib, and if it doesn't, add it and try again.
Some more information (source):
In Linux, the environment variable
LD_LIBRARY_PATH is a colon-separated
set of directories where libraries
should be searched for first, before
the standard set of directories; this
is useful...
Rails: How do I create a default value for attributes in Rails activerecord's model? [duplicate]
...ault values for only new records so that they are available when rendering forms. before_save and before_create are too late and will not work if you want default values to show up in input fields.
after_initialize do
if self.new_record?
# values will be available for new record forms.
se...
JavaScript isset() equivalent
...od, this method is defined up in the prototype chain, because obj inherits form Object.prototype.
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jQuery change input text value
... a book) about jquery where I can really learn about selectors? especially form selectorS?
– Joricam
Apr 18 '11 at 21:52
7
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Access lapply index names inside FUN
...ke function(x){parent.frame()$i+0} or function(x){--parent.frame()$i}.
Performance Impact
Will the forced duplication cause performance loss? Yes! here are the benchmarks:
> x <- as.list(seq_len(1e6))
> system.time( y <- lapply(x, function(x){parent.frame()$i[]}) )
user system elapse...
Simple example of threading in C++
...h execution, therefore blocks its own execution.
t1.join();
}
More information about std::thread here
On GCC, compile with -std=c++0x -pthread.
This should work for any operating-system, granted your compiler supports this (C++11) feature.
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Getting full URL of action in ASP.NET MVC [duplicate]
...script which is beneficial in many situations.
UPDATE: The way to get url formed outside of the page itself is well described in answers above.
Or you could do a oneliner like following:
new UrlHelper(actionExecutingContext.RequestContext).Action(
"SessionTimeout", "Home",
new {area = s...
Why java.util.Optional is not Serializable, how to serialize the object with such fields
...ion related problems can be solved by decoupling the persistent serialized form from the actual runtime implementation you operate on.
/** The class you work with in your runtime */
public class My implements Serializable {
private static final long serialVersionUID = 1L;
Optional<Integ...
Ruby on Rails: Where to define global constants?
...rds immutable objects on your class boundary in Ruby and (2) you keep a uniform interface on your class with the possibility to adapt the return value later based on inherent state (e.g. by reading the colours from the DB) without changing the interface.
– Holger Just
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