大约有 18,000 项符合查询结果（耗时：0.0607秒） [XML]
Why should I implement ICloneable in c#?
Can you explain to me why I should inherit from ICloneable and implement the Clone() method?
4 Answers
...
How do I make a transparent canvas in html5?
How can I make a canvas transparent? I need to because I want to put two canvases on top of one another.
6 Answers
...
Rails how to run rake task
How do I run this rake file in terminal/console?
6 Answers
6
...
What does |= (single pipe equal) and &=(single ampersand equal) mean
...
They're compound assignment operators, translating (very loosely)
x |= y;
into
x = x | y;
and the same for &. There's a bit more detail in a few cases regarding an implicit cast, and the target variable is only evaluated once...
Convert numpy array to tuple
...
>>> arr = numpy.array(((2,2),(2,-2)))
>>> tuple(map(tuple, arr))
((2, 2), (2, -2))
share
|
improve this answer
|
...
How to create a loop in bash that is waiting for a webserver to respond?
...
Combining the question with chepner's answer, this worked for me:
until $(curl --output /dev/null --silent --head --fail http://myhost:myport); do
printf '.'
sleep 5
done
...
What's the difference between the build and create methods in FactoryGirl?
...
The create() method persists the instance of the model while the build() method keeps it only on memory.
Personally, I use the create() method only when persistence is really necessary since writing to DB makes testing time consuming.
...
How long is the SHA256 hash?
I'm going to run SHA256 on a password + salt, but I don't know how long to make my VARCHAR when setting up the MySQL database. What is a good length?
...
initializing a boolean array in java
...
I just need to initialize all the array elements to Boolean false.
Either use boolean[] instead so that all values defaults to false:
boolean[] array = new boolean[size];
Or use Arrays#fill() to fill the entire array with Boolean.FALSE:
Boolean[] array = new Boo...
NSLog/printf specifier for NSInteger?
A NSInteger is 32 bits on 32-bit platforms, and 64 bits on 64-bit platforms. Is there a NSLog specifier that always matches the size of NSInteger ?
...