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How to check if a number is a power of 2
...ndaddy of them, the book "Hacker's Delight" by Henry Warren, Jr.:
http://www.hackersdelight.org/
As Sean Anderson's page explains, the expression ((x & (x - 1)) == 0) incorrectly indicates that 0 is a power of 2. He suggests to use:
(!(x & (x - 1)) && x)
to correct that probl...
Throw keyword in function's signature
... practice. On the contrary, it is generally considered a bad idea.
http://www.gotw.ca/publications/mill22.htm goes into a lot more detail about why, but the problem is partly that the compiler is unable to enforce this, so it has to be checked at runtime, which is usually undesirable. And it is not...
When to use @QueryParam vs @PathParam
...with algorithm. For example the google engine use query strings:
http:// www.google.com/search?q=rest
To sum up, there's not any strong reason to use one of this methods but whenever you can, use URI variables.
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Can't append element
... JavaScript file using the jQuery function getScript
$.getScript('http://www.whatever.com/shareprice/shareprice.js', function() {
Display.sharePrice();
});
Now the external script will be called, and if it cannot be loaded it will gracefully degrade.
...
What's the difference between a Future and a Promise?
...eded.
For example take a look at how promises are defined in javascript:
https://promisesaplus.com/
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise
The focus is on the composability using the then method like:
asyncOp1()
.then(function(op1Result){
// d...
.gitignore and “The following untracked working tree files would be overwritten by checkout”
...nd newer
git clean -d -fx .
older git
git clean -d -fx ""
http://www.kernel.org/pub/software/scm/git/docs/git-clean.html
-x means ignored files are also removed as well as files unknown to git.
-d means remove untracked directories in addition to untracked files.
-f is required to force...
How do I configure Maven for offline development?
....xsd" xmlns="http://maven.apache.org/SETTINGS/1.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<mirrors>
<mirror>
<mirrorOf>*</mirrorOf>
<name>repo</name>
<url>http://maven.yourorganization.com:8081/artifactory/rep...
Does JavaScript have a method like “range()” to generate a range within the supplied bounds?
...> i + *lowerBound*);
An article describing this in more detail: http://www.2ality.com/2014/05/es6-array-methods.html
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How to specify new GCC path for CMake
...
Set CMAKE_C_COMPILER to your new path.
See here: http://www.cmake.org/Wiki/CMake_Useful_Variables
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Emulate a do-while loop in Python?
...t exists) an out of the try, but not out of the loop.
Related PEP: http://www.python.org/dev/peps/pep-3136
Related question: Breaking out of nested loops
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