大约有 42,000 项符合查询结果（耗时：0.0485秒） [XML]
What are the basic rules and idioms for operator overloading?
Note: The answers were given in a specific order , but since many users sort answers according to votes, rather than the time they were given, here's an index of the answers in the order in which they make most sense:
...
Why use a prime number in hashCode?
I was just wondering why is that primes are used in a class's hashCode() method? For example, when using Eclipse to generate my hashCode() method there is always the prime number 31 used:
...
When is null or undefined used in JavaScript? [duplicate]
I am really confused as to when JavaScript returns null or undefined . Also different browsers seem to be returning these differently.
...
Storing time-series data, relational or non?
I am creating a system which polls devices for data on varying metrics such as CPU utilisation, disk utilisation, temperature etc. at (probably) 5 minute intervals using SNMP. The ultimate goal is to provide visualisations to a user of the system in the form of time-series graphs.
...
How do I read the contents of a Node.js stream into a string variable?
I'm hacking on a Node program that uses smtp-protocol to capture SMTP emails and act on the mail data. The library provides the mail data as a stream, and I don't know how to get that into a string.
...
Memoization in Haskell?
Any pointers on how to solve efficiently the following function in Haskell, for large numbers (n > 108)
8 Answers
...
How do you calculate the average of a set of circular data? [closed]
I want to calculate the average of a set of circular data. For example, I might have several samples from the reading of a compass. The problem of course is how to deal with the wraparound. The same algorithm might be useful for a clockface.
...
Extract first item of each sublist
I am wondering what is the best way to extract the first item of each sublist in a list of lists and append it to a new list. So if I have:
...
In Git, how can I write the current commit hash to a file in the same commit
I'm trying to do a fancy stuff here with Git hooks, but I don't really know how to do it (or if it's possible).
7 Answers
...
What are metaclasses in Python?
In Python, what are metaclasses and what do we use them for?
22 Answers
22
...