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lenses, fclabels, data-accessor - which library for structure access and mutation is better
...ar libraries for accessing and manipulating fields of records. The ones I know of are: data-accessor, fclabels and lenses.
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CORS - How do 'preflight' an httprequest?
...ermissions to make the actual request. Your preflight response needs to acknowledge these headers in order for the actual request to work.
For example, suppose the browser makes a request with the following headers:
Origin: http://yourdomain.com
Access-Control-Request-Method: POST
Access-Control-R...
Get keys from HashMap in Java
...
This is doable, at least in theory, if you know the index:
System.out.println(team1.keySet().toArray()[0]);
keySet() returns a set, so you convert the set to an array.
The problem, of course, is that a set doesn't promise to keep your order. If you only have one...
ObjectiveC Parse Integer from String
...] may not behave exactly how you expect. From the docs: This property is 0 if the string doesn’t begin with a valid decimal text representation of a number. For example, [@" 2 asdghjk" intValue] will return 2.
– zekel
Dec 2 '15 at 15:37
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Outputting data from unit test in python
If I'm writing unit tests in python (using the unittest module), is it possible to output data from a failed test, so I can examine it to help deduce what caused the error? I am aware of the ability to create a customized message, which can carry some information, but sometimes you might deal with m...
How can I declare and define multiple variables in one line using C++?
...InputValue, presentInputValue;) or if they just happen to be the same type now but don't really need to be (uint8_t height, width; might turn into uint8_t height; uint16_t width; in the future and should have been uint8_t height; uint8_t width; to begin with).
– altendky
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How to create the most compact mapping n → isprime(n) up to a limit N?
...the primality test.
There isn't really a data structure for you to query. If you have lots of numbers to test, you should probably run a probabilistic test since those are faster, and then follow it up with a deterministic test to make sure the number is prime.
You should know that the math behind...
How can you encode a string to Base64 in JavaScript?
...) accepts a “string” where each character represents an 8-bit byte – if you pass a string containing characters that can’t be represented in 8 bits, it will probably break. This isn’t a problem if you’re actually treating the string as a byte array, but if you’re trying to do something...
Python argparse: Make at least one argument required
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if not (args.process or args.upload):
parser.error('No action requested, add -process or -upload')
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OceanBase使用libeasy原理源码分析：客户端 - 数据库(内核) - 清泛网 - 专...
... EASY_MESSAGE_SESSION_HEADER;
ev_tstamp timeout, now;
ev_timer timeout_watcher;
// 用于串入session list的链表节点
easy_list_t session_list_node;
//为了快速根据packet id定位到发送队列中的session...