大约有 42,000 项符合查询结果（耗时：0.0825秒） [XML]
Find an item in List by LINQ?
Here I have a simple example to find an item in a list of strings. Normally I use for loop or anonymous delegate to do it like this:
...
Is Python interpreted, or compiled, or both?
...d is not a property of the language but a property of the implementation. For most languages, most if not all implementations fall in one category, so one might save a few words saying the language is interpreted/compiled too, but it's still an important distinction, both because it aids understandi...
What is a elegant way in Ruby to tell if a variable is a Hash or an Array?
...
You can just do:
@some_var.class == Hash
or also something like:
@some_var.is_a?(Hash)
It's worth noting that the "is_a?" method is true if the class is anywhere in the objects ancestry tree. for instance:
@some_var.is_a?(Object) # => true
the above is tru...
How to permanently set $PATH on Linux/Unix? [closed]
I'm trying to add a directory to my path so it will always be in my Linux path. I've tried:
24 Answers
...
Difference between static and shared libraries?
...
Shared libraries are .so (or in Windows .dll, or in OS X .dylib) files. All the code relating to the library is in this file, and it is referenced by programs using it at run-time. A program using a shared library only makes reference to the code that...
Is jquery a javascript library or framework? [closed]
Here, jquery is mentioned under framework category:
http://en.wikipedia.org/wiki/Comparison_of_JavaScript_frameworks
7 Ans...
Using a strategy pattern and a command pattern
Both design patterns encapsulate an algorithm and decouple implementation details from their calling classes. The only difference I can discern is that the Strategy pattern takes in parameters for execution, while the Command pattern doesn't.
...
What are the differences between Perl, Python, AWK and sed? [closed]
...
In order of appearance, the languages are sed, awk, perl, python.
The sed program is a stream editor and is designed to apply the actions from a script to each line (or, more generally, to specified ranges of lines) of the inpu...
How to check for an undefined or null variable in JavaScript?
...
You have to differentiate between cases:
Variables can be undefined or undeclared. You'll get an error if you access an undeclared variable in any context other than typeof.
if(typeof someUndeclaredVar == whatever) // works
if(someUndeclaredVar) // throws error
A variable that has been de...
How using try catch for exception handling is best practice
...e maintaining my colleague's code from even someone who claims to be a senior developer, I often see the following code:
15...