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Extracting bits with a single multiplication

..... A multiplication is a bunch of shift-and-add operations. The key is to allow overflow to "shift away" the bits we don't need and put the ones we want in the right place. Multiplication by 4 (00000100) would shift everything left by 2 and get you to a00b0000 . To get the b to move up we need to...
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Extending an Object in Javascript

... I have one question: how is the Person() constructor being called when you do new Robot()? It seems to me that you should call that base class constructor instead of doing this.name = name; in the Robot() constructor... – Alexis Wilke Apr 7 '14 a...
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How is a CRC32 checksum calculated?

... 1 0000 0100 1100 0001 0001 1101 1011 0111 The highest term (x32) is usually not explicitly written, so it can instead be represented in hex just as 0x 04 C1 1D B7 Feel free to count the 1s and 0s, but you'll find they match up with the polynomial, where 1 is bit 0 (or the first bit) and x ...
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Building a minimal plugin architecture in Python

... Mine is, basically, a directory called "plugins" which the main app can poll and then use imp.load_module to pick up files, look for a well-known entry point possibly with module-level config params, and go from there. I use file-monitorin...
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Python: try statement in a single line

...ther dynamic languages. The safer way (and the prevailing style) is to set all variables to something. If they might not get set, set them to None first (or 0 or '' or something if it is more applicable.) If you do assign all the names you are interested in first, you do have options. The best...
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How do I check if a list is empty?

...cMahon - it's a trade-off between explicitness and type flexibility. generally, "being explicit" means not doing "magical" things. on the other hand, "duck typing" means working with more general interfaces, rather than explicitly checking for types. so something like if a == [] is forcing a part...
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Getting All Variables In Scope

Is there a way to get all variables that are currently in scope in javascript? 10 Answers ...
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Mapping over values in a python dictionary

..., f(kv[1])), my_dictionary.iteritems())) but that's not that readable, really. share | improve this answer | follow | ...
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How to validate an email address in JavaScript

...b"@gmail.com, _@gmail.com, 1@gmail.com , 1_example@something.gmail.com are all valid, but Gmail will never allow any of these email addresses. You should do this by accepting the email address and sending an email message to that email address, with a code/link the user must visit to confirm validit...
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Reference - What does this error mean in PHP?

...m. (Note: You might have multiple blocks if you had code that was automatically constructed) Also make sure you don't have any Byte Order Marks in your code, for example when the encoding of the script is UTF-8 with BOM. Related Questions: Headers already sent by PHP All PHP "Headers already sen...