大约有 38,000 项符合查询结果（耗时：0.0454秒） [XML]
Can I use the range operator with if statement in Swift?
...
|
show 10 more comments
97
...
Why java.lang.Object is not abstract? [duplicate]
...e developers to figure out how they should be implementing them, making it more obvious that they should be consistent (see Effective Java). However, I'm more of the opinion that hashCode(), equals() and clone() belong on separate, opt-in abstractions (i.e. interfaces). The other methods, wait(), no...
How can I represent an 'Enum' in Python?
...o been backported to 3.3, 3.2, 3.1, 2.7, 2.6, 2.5, and 2.4 on pypi.
For more advanced Enum techniques try the aenum library (2.7, 3.3+, same author as enum34. Code is not perfectly compatible between py2 and py3, e.g. you'll need __order__ in python 2).
To use enum34, do $ pip install enum34
To...
Merging dictionaries in C#
What's the best way to merge 2 or more dictionaries ( Dictionary<T1,T2> ) in C#?
(3.0 features like LINQ are fine).
2...
How can I view a git log of just one user's commits?
...its commited (but not necessarily authored) by Adam, replace %an with %cn. More details about this are in my blog post here: http://dymitruk.com/blog/2012/07/18/filtering-by-author-name/
share
|
imp...
What is the most efficient way to concatenate N arrays?
...
If you're concatenating more than two arrays, concat() is the way to go for convenience and likely performance.
var a = [1, 2], b = ["x", "y"], c = [true, false];
var d = a.concat(b, c);
console.log(d); // [1, 2, "x", "y", true, false];
For conca...
What is the best collation to use for MySQL with PHP? [closed]
..., unless I have a good reason to prefer a specific language.
You can read more on specific unicode character sets on the MySQL manual - http://dev.mysql.com/doc/refman/5.0/en/charset-unicode-sets.html
share
|
...
How do I use DateTime.TryParse with a Nullable?
...e.TryParse("some date text", out d2);
if (success) d=d2;
(There might be more elegant solutions, but why don't you simply do something as above?)
share
|
improve this answer
|
...
CSS: Setting width/height as Percentage minus pixels
I'm trying to create some re-usable CSS classes for more consistency and less clutter on my site, and I'm stuck on trying to standardize one thing I use frequently.
...
Best way to merge two maps and sum the values of same key?
...ator, so you get the sum of values for each duplicate key.
Edit: A little more detail, as per user482745's request.
Mathematically a semigroup is just a set of values, together with an operator that takes two values from that set, and produces another value from that set. So integers under additi...