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What is Node.js? [closed]
...figure out how screwed it really is).
Node.js is SINGLE THREADED and LOCK FREE. Node.js, as a very deliberate design choice only has a single thread per process. Because of this, it's fundamentally impossible for multiple threads to access data simultaneously. Thus, no locks are needed. Threads are...
Programmer Puzzle: Encoding a chess board state throughout a game
...mistake. See Chess punctuation.
Additionally you could also need to store free text as the moves are described.
I am assuming that the moves are sufficient so there will be no annotations.
Algebraic Notation
We could simply store the the text of the move here (“e4”, “Bxb5”, etc). Includi...
What are the underlying data structures used for Redis?
...r a char * that allows you to store the length of the string and number of free bytes as a prefix.
Because the length of the string is stored, strlen is an O(1) operation. Also, because the length is known, Redis strings are binary safe. It is perfectly legal for a string to contain the null charac...
data.table vs dplyr: can one do something well the other can't or does poorly?
...processing time. We optimise dplyr for expressiveness on medium data;
feel free to use data.table for raw speed on bigger data.
The flexibility of dplyr also means that you can easily tweak performance
characteristics using the same syntax. If the performance of dplyr with
the data frame backend is...
How do I pass a unique_ptr argument to a constructor or a function?
...library function.
If you take a unique_ptr by value, you can move from it freely. But movement doesn't actually happen because of std::move. Take the following statement:
std::unique_ptr<Base> newPtr(std::move(oldPtr));
This is really two statements:
std::unique_ptr<Base> &&...
Reference: mod_rewrite, URL rewriting and “pretty links” explained
... coming in on that port and returning a response. A web server is entirely free to respond to any request in any way it sees fit/in any way you have configured it to respond. This response is not a file, it's an HTTP response which may or may not have anything to do with physical files on any disk. ...
Ukkonen's suffix tree algorithm in plain English
...g sections may contain inaccuracies (or worse). If you encounter any, feel free to edit.
Prerequisites
The starting point of the following explanation assumes you're familiar with the content and use of suffix trees, and the characteristics of Ukkonen's algorithm, e.g. how you're extending the suf...
SQL query return data from multiple tables
...his Fluffeh. Others who may read this and may feel that I'm wrong are 101% free to edit and criticise my answer. (Honestly, I feel very thankful for correcting my mistake(s).)
I'll be posting some of the frequently asked questions in MySQL tag.
Trick No. 1 (rows that matches to multiple conditio...
构建高并发高可用的电商平台架构实践 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...compact，对过期数据进行清除，提高查询的性能。
Schema free
HBase没有像关系型数据库那样的严格的schema，可以自由的增加和删除schema中的字段。
HBase分布式数据库，对于二级索引支持的不太好，目前只支持在rowkey上的索引，...
What are the undocumented features and limitations of the Windows FINDSTR command?
...ent files in that child folder would also be missed.
The commands work bug free if the same file names are created on a machine that has NTFS 8.3 name generation disabled. Of course b.txt2 would not be found, but c.txt would be found properly.
Not all short names trigger the bug. All instances of bu...