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Cache Invalidation — Is there a General Solution?
...ched value of b. If you chose 2 you must still check b every time but can fall back on the cache for a if b checks out.
If you layer caches you must consider whether you have violated the 'rules' of the system as a result of the combined behaviour.
If you know that a always has validity if b does...
Using Sass Variables with CSS3 Media Queries
...de.
Achieving your expected result would only be possible if SASS grabbed all rules and properties in your stylesheet containing your $base_width variable and copied/changed them accordingly.
Since it won't work automatically you could do it by hand like this:
@media screen and (max-width: 1170px...
How to delete files/subfolders in a specific directory at the command prompt in Windows
Say, there is a variable called %pathtofolder% , as it makes it clear it is a full path of a folder.
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Why doesn't Dictionary have AddRange?
...doesn't have any meaning to an associative container, as the range of data allows for duplicate entries. E.g if you had an IEnumerable<KeyValuePair<K,T>> that collection does not guard against duplicate entries.
The behavior of adding a collection of key-value pairs, or even merging tw...
Real World Example of the Strategy Pattern
...
What about this:
You have to encrypt a file.
For small files, you can use "in memory" strategy, where the complete file is read and kept in memory ( let's say for files < 1 gb )
For large files, you can use another strategy, where parts of the file are read in memory and...
What's the meaning of “=>” (an arrow formed from equals & greater than) in JavaScript?
... are part of the ECMAscript 6 specification. They are not yet supported in all browsers, but they are partially or fully supported in Node v. 4.0+ and in most modern browsers in use as of 2018. (I’ve included a partial list of supporting browsers below).
You can read more in the Mozilla documentat...
“A lambda expression with a statement body cannot be converted to an expression tree”
...e:
Think carefully when using this method, because this way, you will have all query result in memory, that may have unwanted side effects on the rest of your code.
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Virtual functions and performance - C++
...e a very slight effect on performance, but it's unlikely to affect the overall performance of your application. Better places to look for performance improvements are in algorithms and I/O.
An excellent article that talks about virtual functions (and more) is Member Function Pointers and the Fastes...
How to test if parameters exist in rails
...re asking about existence. You might need to differentiate:
Not there at all.
There but nil.
There but false.
There but an empty string.
as well. Hard to say without more details of your precise situation.
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What is /dev/null 2>&1?
... either appending to or writing to /dev/null has the same net effect. I usually just use > for that reason.)
2>&1 redirects standard error (2) to standard output (1), which then discards it as well since standard output has already been redirected.
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