大约有 45,000 项符合查询结果（耗时：0.0687秒） [XML]
When to wrap quotes around a shell variable?
...
General rule: quote it if it can either be empty or contain spaces (or any whitespace really) or special characters (wildcards). Not quoting strings with spaces often leads to the shell breaking apart a single argument into many.
$? doesn't nee...
Java ArrayList copy
...follow
|
edited Nov 28 '16 at 15:05
Fritz Duchardt
6,82122 gold badges2929 silver badges4848 bronze badges
...
When would you use the Builder Pattern? [closed]
...e common , real world examples of using the Builder Pattern? What does it buy you? Why not just use a Factory Pattern?
...
Distributed sequence number generation?
...bers and unique IDs that are (optionally) loosely sortable by a specific criteria (typically generation time). True sequence numbers imply knowledge of what all other workers have done, and as such require shared state. There is no easy way of doing this in a distributed, high-scale manner. You coul...
Are 2^n and n*2^n in the same time complexity?
Resources I've found on time complexity are unclear about when it is okay to ignore terms in a time complexity equation, specifically with non-polynomial examples.
...
Convenient C++ struct initialisation
I'm trying to find a convenient way to initialise 'pod' C++ structs. Now, consider the following struct:
13 Answers
...
Which “href” value should I use for JavaScript links, “#” or “javascript:void(0)”?
...purpose of running JavaScript code. Which is better, in terms of functionality, page load speed, validation purposes, etc.?
...
How does the String class override the + operator?
Why in Java you're able to add Strings with the + operator, when String is a class? In the String.java code I did not find any implementation for this operator. Does this concept violate object orientation?
...
Possibility of duplicate Mongo ObjectId's being generated in two different collections?
Is it possible for the same exact Mongo ObjectId to be generated for a document in two different collections? I realize that it's definitely very unlikely, but is it possible?
...
How do I find the duplicates in a list and create another list with them?
...tes, something like:
a = [1,2,3,2,1,5,6,5,5,5]
import collections
print([item for item, count in collections.Counter(a).items() if count > 1])
## [1, 2, 5]
Note that Counter is not particularly efficient (timings) and probably overkill here. set will perform better. This code computes a list...