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Why exactly is eval evil?
...or already what I really want?
The main reasons to avoid EVAL for slightly more advanced users:
you want to make sure that your code is compiled, because the compiler can check code for many problems and generates faster code, sometimes MUCH MUCH MUCH (that's factor 1000 ;-) )faster code
code that...
How can I add a custom HTTP header to ajax request with js or jQuery?
...l: 'foo/bar', headers: { 'x-some-other-header': 'some value' } });
Edit (more info): One thing to be aware of is that with ajaxSetup you can only define one set of default headers and you can only define one beforeSend. If you call ajaxSetup multiple times, only the last set of headers will be se...
Should I use string.isEmpty() or “”.equals(string)?
...ernal length of an private array whereas equals(Object anObject) does much more (e.g. checking instanceof). Perfromance-wise, isEmpty() is generally faster.
– Turing85
Jul 21 '15 at 8:28
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Read a variable in bash with a default value
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PowerShell says “execution of scripts is disabled on this system.”
... this into your PowerShell window:
Set-ExecutionPolicy RemoteSigned
For more information, see Using the Set-ExecutionPolicy Cmdlet.
When you are done, you can set the policy back to its default value with:
Set-ExecutionPolicy Restricted
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How is CountDownLatch used in Java Multithreading?
...'s not reusable: once count reaches zero you cannot use CountDownLatch any more.
Edit:
Use CountDownLatch when one thread (like the main thread) requires to wait for one or more threads to complete, before it can continue processing.
A classical example of using CountDownLatch in Java is a ser...
Compare two objects in Java with possible null values
... Why not just change the String types to Objects - making it more generic? And then it is the same as what you will get if you move to Java 7.
– Tom
Nov 7 '13 at 18:31
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Convert Int to String in Swift
... interpolation when String has a constructor that accepts an Int. Its much more clear and concise.
– Isuru
Sep 15 '14 at 6:30
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Delete local Git branches after deleting them on the remote repo
...r, or any other branch for that matter, doesn't get removed by greping for more. In that case you would go:
git branch --merged | grep -v "\*" | grep -v "YOUR_BRANCH_TO_KEEP" | xargs -n 1 git branch -d
So if we wanted to keep master, develop and staging for instance, we would go:
git branch --me...
How to delete an item in a list if it exists?
... by PEP 202. The rationale behind it is that List comprehensions provide a more concise way to create lists in situations where map() and filter() and/or nested loops would currently be used.
cleaned_list = [ x for x in some_list if x is not thing ]
Generator expressions were introduced in versio...