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Transactions in .net
...ultiple providers (although DTC will get involved if you talk to more than one).
For example:
using(TransactionScope tran = new TransactionScope()) {
CallAMethodThatDoesSomeWork();
CallAMethodThatDoesSomeMoreWork();
tran.Complete();
}
Note here that the two methods can handle their o...
Javascript reduce on array of objects
...y
foo // [ { a: 1, b: 2, c: 3 }, { b: 2 }, { c: 3 } ]
If however we had done it this way, with the initial value:
const bar = foo.reduce( badCallback, {})
// foo is still OK
foo // { a: 1, b: 2, c: 3 }
For the record, unless you intend to mutate the original object, set the first parameter of Obj...
How does Java Garbage Collection work with Circular References?
...g time, chances are pretty good that it'll continue to live even longer.
Nonetheless, the basic idea remains the same: it's all based on starting from some root set of things that it takes for granted could still be used, and then chasing all the pointers to find what else could be in use.
Interes...
How to read XML using XPath in Java
...et a particular value from child nodes on a parent node. how that will be done? thanks
– kaibuki
May 12 '10 at 5:56
i...
Ruby: kind_of? vs. instance_of? vs. is_a?
...) kind_of?(class)Returns true if class is the class of obj, or if class is one of the superclasses of obj or modules included in obj.
If that is unclear, it would be nice to know what exactly is unclear, so that the documentation can be improved.
When should I use which?
Never. Use polymorphism i...
jQuery Ajax POST example with PHP
... });
// Callback handler that will be called on success
request.done(function (response, textStatus, jqXHR){
// Log a message to the console
console.log("Hooray, it worked!");
});
// Callback handler that will be called on failure
request.fail(function (jqXHR, ...
Purpose of #!/usr/bin/python3
...nds are:
/usr/bin/env python
The /usr/bin/env form of shebang line has one further special property. Before looking for installed Python interpreters, this form will search the executable PATH for a Python executable. This corresponds to the behaviour of the Unix env program, which performs a PA...
How does generic lambda work in C++14?
...perator member template (14.5.2) whose template-parameter-list consists of one invented type template-parameter
for each occurrence of auto in the lambda’s parameter-declaration-clause, in order of appearance.
The invented type template-parameter is a parameter pack if the corresponding parame...
Call a function with argument list in python
...
One thing that I didn't find mentioned very often is how to call a function with *args, if you have a list or tuple that you want to pass. For that you need to call it like this: wrapper1(func2, *mylist)
...
python: Change the scripts working directory to the script's own directory
...not simply os.chdir(os.path.dirname(__file__))?
– Colonel Panic
Jul 28 '13 at 11:50
8
__file__ fa...