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How can I count the occurrences of a list item?
...is not faster by a factor of 2, Counter is faster by a factor of n (O(n^2) vs O(n)).
– Martijn Pieters♦
May 23 '17 at 10:13
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Hidden Features of C++? [closed]
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community wiki
2 revsFerruccio
11
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Do while loop in SQL Server 2008
...cause I'm iterating a cursor, and I'm looking largely for optimal clarity (vs. optimal speed). In T-SQL that seems to fit a WHILE TRUE / IF BREAK.
If that's the scenario that brought you here, this snippet may save you a moment. Otherwise, welcome back, me. Now I can be certain I've been here more ...
Difference between char* and const char*?
...the char to which name points to (https://msdn.microsoft.com/en-us/library/vstudio/whkd4k6a(v=vs.100).aspx, see "Examples"). In this case, the const specifier applies to char, not the asterisk.
According to the MSDN page and http://en.cppreference.com/w/cpp/language/declarations, the const before t...
How do I suspend painting for a control and its children?
...know, but sending "false" does not appear to work in recent versions of c#/VS. I had to change false to 0 and true to 1.
– Maury Markowitz
Sep 21 '15 at 20:20
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How to create a GUID/UUID in Python
...6-7 bits on version info). Or use only 15 bytes (losing 1-2 bits of random vs. UUIDv4) and avoid the need to trim off = signs while also reducing the encoded size to 20 bytes (from 24, trimmed to 22), as any multiple of 3 bytes encodes to #bytes / 3 * 4 base64 characters with no padding required.
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In Clojure, when should I use a vector over a list, and the other way around?
...ctor:
Indexed access performance - You get ~O(1) cost for indexed access vs. O(n) for lists
Appending - with conj is ~O(1)
Convenient notation - I find it both easier to type and to read [1 2 3] than '(1 2 3) for a literal list in circumstances where either would work.
When to use a list:
When...
Which .NET Dependency Injection frameworks are worth looking into? [closed]
...Assembly scanning extensions for Microsoft.Extensions.DependencyInjection.
VS MEF - Managed Extensibility Framework (MEF) implementation used by Visual Studio.
TinyIoC - An easy to use, hassle free, Inversion of Control Container for small projects, libraries and beginners alike.
Original answer f...
Why does Java's hashCode() in String use 31 as a multiplier?
...cause it leads to denser code: The two LEA instructions only take 6 bytes vs. the 7 bytes for move+shift+subtract for the multiplication by 31. One possible caveat is that the 3-argument LEA instructions used here became slower on Intel's Sandy bridge architecture, with an increased latency of 3 c...
Java: Multiple class declarations in one file
...vel interfaces as well.
e.g., elsewhere on SO: Non-public top-level class vs static nested class
As for changes in behavior between versions, there was this discussion about something that "worked perfectly" in 1.2.2. but stopped working in 1.4 in sun's forum: Java Compiler - unable to declare a n...