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What is a magic number, and why is it bad? [closed]
...use a magic number will never change doesn't mean it shouldn't be replaced by a constant. My code is full of global constants like HzPerMHz and msecPerSecond. These will never change, but they make the meaning clearer, and provide some protection against typos.
– Jeanne Pindar
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Why is IoC / DI not common in Python?
...er. Guice is a Java DI framework where everything is written in Java code. By writing declaratively a DI container also adds support for post processing the declerations before initialization (e.g., replace property placeholders with actual values)
– IttayD
Oc...
Is there a way to get element by XPath using JavaScript in Selenium WebDriver?
...r.mozilla.org/en-US/docs/Web/API/Document.evaluate
function getElementByXpath(path) {
return document.evaluate(path, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
}
console.log( getElementByXpath("//html[1]/body[1]/div[1]") );
<div>foo</div>
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How to turn on (literally) ALL of GCC's warnings?
... that flag with clang because my philosophy is that I want all warnings on by default (because someone thought it was helpful enough to add to the compiler), and if I don't like it, I turn off that warning specifically. The point is that you don't know about warnings that don't trigger, but you do k...
Can I embed a custom font in an iPhone application?
...fonts in their application bundle and register those fonts with the system by including the UIAppFonts key in their Info.plist file. The value of this key is an array of strings identifying the font files in the application’s bundle. When the system sees the key, it loads the specified fonts and m...
When to use ' (or quote) in Lisp?
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Short answer
Bypass the default evaluation rules and do not evaluate the expression (symbol or s-exp), passing it along to the function exactly as typed.
Long Answer: The Default Evaluation Rule
When a regular (I'll come to that later) ...
When should one use a spinlock instead of mutex?
...il being woken up, which will be the case once the mutex is being unlocked by whatever thread was holding the lock before. When a thread tries to lock a spinlock and it does not succeed, it will continuously re-try locking it, until it finally succeeds; thus it will not allow another thread to take ...
How to automatically install Emacs packages by specifying a list of package names?
...ch and install the packages, so that I don't need to install them manually by calling M-x package-list-packages . How to do that?
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How does git compute file hashes?
The SHA1 hashes stored in the tree objects (as returned by git ls-tree ) do not match the SHA1 hashes of the file content (as returned by sha1sum )
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What is the difference between “Class.forName()” and “Class.forName().newInstance()”?
...alling clazz.newInstance() creates a new instance of the class represented by this Class object. The class is instantiated as if by a new expression with an empty argument list. In other words, this is here actually equivalent to a new Demo() and returns a new instance of Demo.
And running this De...