大约有 16,000 项符合查询结果（耗时：0.0286秒） [XML]
Java to Clojure rewrite
I have just been asked by my company to rewrite a largish (50,000 single lines of code) Java application (a web app using JSP and servlets) in Clojure. Has anyone else got tips as to what I should watch out for?
...
parseInt(null, 24) === 23… wait, what?
...d with parseInt to see how it handles values not yet initialized and I stumbled upon this gem. The below happens for any radix 24 or above.
...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
I have a contacts table which contains fields such as postcode , first name , last name , town , country , phone number etc, all of which are defined as VARCHAR(255) even though none of these fields will ever come close to having 255 characters. (If you're wondering, it's this way becaus...
Explain which gitignore rule is ignoring my file
Is there any way to see why some file is getting ignored by git (i.e. which rule in a .gitignore file is causing the file to be ignored)?
...
How to navigate through a vector using iterators? (C++)
... the [] operator or the "at" method. From what I understand, iterators can be used to navigate through containers, but I've never used iterators before, and what I'm reading is confusing.
...
Read an Excel file directly from a R script
... Perl installed on your system -- usually already true on MacOS and Linux, but takes an extra step on Windows, i.e. see http://strawberryperl.com/). There are various caveats, and alternatives, listed on the R wiki page.
The only reason I see not to do this directly is that you may want to examine ...
application/x-www-form-urlencoded or multipart/form-data?
...n/x-www-form-urlencoded and multipart/form-data . I understand that most browsers are only able to upload files if multipart/form-data is used. Is there any additional guidance when to use one of the encoding types in an API context (no browser involved)? This might e.g. be based on:
...
What are the differences between delegates and events?
What are the differences between delegates and an events? Don't both hold references to functions that can be executed?
12 ...
When should we use mutex and when should we use semaphore
...
Here is how I remember when to use what -
Semaphore:
Use a semaphore when you (thread) want to sleep till some other thread tells you to wake up. Semaphore 'down' happens in one thread (producer) and semaphore 'up' (for same semaphore) happen...
Why does Git say my master branch is “already up to date” even though it is not?
...
I think your basic issue here is that you're misinterpreting and/or misunderstanding what git does and why it does it.
When you clone some other repository, git makes a copy of whatever is "over there". It also takes "their" branch labe...