大约有 40,000 项符合查询结果（耗时：0.0324秒） [XML]
In Ruby, is there an Array method that combines 'select' and 'map'?
...ns as its eager version. It doesn't speed anything up, it just changes the order of execution of each iteration—the last function in the chain "pulls" values as needed from the previous functions in reverse order.
– pje
Feb 13 '18 at 17:15
...
Do I need elements in persistence.xml?
...e Java EE 5 tutorial:
<persistence>
<persistence-unit name="OrderManagement">
<description>This unit manages orders and customers.
It does not rely on any vendor-specific features and can
therefore be deployed to any persistence provider.
...
Have the same README both in Markdown and reStructuredText
... on GitHub. For this I have written my README using the Markdown syntax in order to have it nicely formatted on GitHub.
8 A...
Concatenate text files with Windows command line, dropping leading lines
...ch means it's listed at the end of the files in the loaction (alphabetical order), then windows seems to concatenate twice! I ended up using a filename of 1filename.csv to not have the problem. I guess concatting into a different folder should work also...
– SebK
...
Use of Initializers vs Constructors in Java
...
I read a whole article looking for an answer to the init order of initializers vs. their constructors. I didn't find it, so I wrote some code to check my understanding. I thought I would add this little demonstration as a comment. To test your understanding, see if you can predi...
'UserControl' constructor with parameters in C#
...s Designer forces you to provide a parameterless constuctor on controls in order to work properly. Actually, it only requires a parameterless constructor in order to instantiate controls, but not to design them (the designer will actually parse the InitializeComponent method while designing a contro...
How can I select an element with multiple classes in jQuery?
...t write the selectors together without spaces in between:
$('.a.b')
The order is not relevant, so you can also swap the classes:
$('.b.a')
So to match a div element that has an ID of a with classes b and c, you would write:
$('div#a.b.c')
(In practice, you most likely don't need to get that...
How do I merge two dictionaries in a single expression in Python (taking union of dictionaries)?
... example). Even if your values are hashable, since sets are semantically unordered, the behavior is undefined in regards to precedence. So don't do this:
>>> c = dict(a.items() | b.items())
This example demonstrates what happens when values are unhashable:
>>> x = {'a': []}
>&g...
Remove an element from a Bash array
...ating over them backwards (so deleting elements doesn't screw up iteration order). To get the indices you need to access the input array by name, which can be done via bash variable indirection x=1; varname=x; echo ${!varname} # prints "1".
You can't access arrays by name like aryname=a; echo "${$a...
Is it safe to delete an object property while iterating over them?
...s code is legal and will work as expected. Browser quirks affect iteration order and delete statements in general, but not whether the OPs code will work. It's generally best only to delete the current property in the iteration - deleting other properties in the object will unpredictably cause them ...