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Redis strings vs Redis hashes to represent JSON: efficiency?
...e cases):
Store the entire object as JSON-encoded string in a single key and keep track of all Objects using a set (or list, if more appropriate). For example:
INCR id:users
SET user:{id} '{"name":"Fred","age":25}'
SADD users {id}
Generally speaking, this is probably the best method in most cas...
What do the python file extensions, .pyc .pyd .pyo stand for?
...c file that contains the bytecode to make importing it again later easier (and faster).
.pyo: This was a file format used before Python 3.5 for *.pyc files that were created with optimizations (-O) flag. (see the note below)
.pyd: This is basically a windows dll file. http://docs.python.org/faq/win...
What's “P=NP?”, and why is it such a famous question? [closed]
... is perhaps the most famous in all of Computer Science. What does it mean? And why is it so interesting?
6 Answers
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How do I move a file with Ruby?
...u are moving across partitions, "mv" will copy the file to new destination and unlink the source path.
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How to strike through obliquely with css
...with a CSS transform. Doing it this way adds no extra elements to the DOM, and adding/removing the strikethrough is a simple as adding/removing the class.
Here's a demo
Caveats
This will only work down to IE8. IE7 does not support :before, however will degrade gracefully in browsers that do supp...
Remove all the elements that occur in one list from another
Let's say I have two lists, l1 and l2 . I want to perform l1 - l2 , which returns all elements of l1 not in l2 .
7 ...
How to remove trailing whitespaces with sed?
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You can use the in place option -i of sed for Linux and Unix:
sed -i 's/[ \t]*$//' "$1"
Be aware the expression will delete trailing t's on OSX (you can use gsed to avoid this problem). It may delete them on BSD too.
If you don't have gsed, here is the correct (but hard-to...
Array versus linked-list
...er of changing what points to what. Shuffling an array is more complicated and/or takes more memory.
As long as your iterations all happen in a "foreach" context, you don't lose any performance in iteration.
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When should TaskCompletionSource be used?
...n NuGet which allows the async/await keywords in .NET 4.0 projects (VS2012 and higher is recommended).
– Erik
Feb 1 '14 at 18:41
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iPhone UIView Animation Best Practice
...ns:context: method:
Use of this method is discouraged in iPhone OS 4.0 and later. You should use the block-based animation methods instead.
Eg of Block-based Animation based on Tom's Comment
[UIView transitionWithView:mysuperview
duration:0.75
options:UIV...