大约有 45,000 项符合查询结果（耗时：0.0534秒） [XML]
How do I preview emails in Rails?
...n Rails, is there a particularly easy built-in way to preview the template it in the browser or do I need to write some sort of custom controller that pulls it in as its view?
...
What techniques can be used to define a class in JavaScript, and what are their trade-offs?
...ple of ways to go about doing that. What would be the syntax and why would it be done in that way?
19 Answers
...
What can MATLAB do that R cannot do? [closed]
...
Can you use R to replace MATLAB?
Yes.
I used MATLAB for years but switched primarily to R in the last 3 years. At this point, they have much more in common than not. It partially depends on your field and use-case. And as Spencer Graves said previously, it also depends on which "church you...
Best practices for SQL varchar column length [closed]
...
No DBMS I know of has any "optimization" that will make a VARCHAR with a 2^n length perform better than one with a max length that is not a power of 2.
I think early SQL Server versions actually treated a VARCHAR with length 255 differently than one with a higher maximum length. I don't kno...
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...
What is mod_php?
...as an Apache module.
Basically, when loading mod_php as an Apache module, it allows Apache to interpret PHP files (those are interpreted by mod_php).
EDIT : There are (at least) two ways of running PHP, when working with Apache :
Using CGI : a PHP process is launched by Apache, and it is that P...
How do I remove a property from a JavaScript object?
...
console.log(myObject);
For anyone interested in reading more about it, Stack Overflow user kangax has written an incredibly in-depth blog post about the delete statement on their blog, Understanding delete. It is highly recommended.
...
What does enumerate() mean?
...
The enumerate() function adds a counter to an iterable.
So for each element in cursor, a tuple is produced with (counter, element); the for loop binds that to row_number and row, respectively.
Demo:
>>> elements = ('foo', 'bar', 'baz')
>>> for elem i...
How to tell if a file is git tracked (by shell exit code)?
Is there a way to tell if a file is being tracked by running some git command and checking its exit code?
8 Answers
...
How to define “type disjunction” (union types)?
One way that has been suggested to deal with double definitions of overloaded methods is to replace overloading with pattern matching:
...