大约有 4,769 项符合查询结果(耗时:0.0179秒) [XML]
Return a `struct` from a function in C
Today I was teaching a couple of friends how to use C struct s. One of them asked if you could return a struct from a function, to which I replied: "No! You'd return pointers to dynamically malloc ed struct s instead."
...
How to store a command in a variable in a shell script?
...
Use eval:
x="ls | wc"
eval "$x"
y=$(eval "$x")
echo "$y"
share
|
improve this answer
|
follow
|
...
How to get datetime in JavaScript?
...
Semantically, you're probably looking for the one-liner
new Date().toLocaleString()
which formats the date in the locale of the user.
If you're really looking for a specific way to format dates, I recommend the moment.js library.
...
What does {0} mean when initializing an object?
...n {0} is used to initialize an object, what does it mean? I can't find any references to {0} anywhere, and because of the curly braces Google searches are not helpful.
...
How to concatenate string variables in Bash
..."
echo "${foo}"
> Hello World
In general to concatenate two variables you can just write them one after another:
a='Hello'
b='World'
c="${a} ${b}"
echo "${c}"
> Hello World
share
|
improve...
Why are variables “i” and “j” used for counters?
I know this might seem like an absolutely silly question to ask, yet I am too curious not to ask...
23 Answers
...
Outputting data from unit test in python
If I'm writing unit tests in python (using the unittest module), is it possible to output data from a failed test, so I can examine it to help deduce what caused the error? I am aware of the ability to create a customized message, which can carry some information, but sometimes you might deal with m...
What's the difference between ES6 Map and WeakMap?
Looking this and this MDN pages it seems like the only difference between Maps and WeakMaps is a missing "size" property for WeakMaps. But is this true? What's the difference between them?
...
Python datetime - setting fixed hour and minute after using strptime to get day,month,year
I've successfully converted something of 26 Sep 2012 format to 26-09-2012 using:
3 Answers
...
multiprocessing.Pool: When to use apply, apply_async or map?
I have not seen clear examples with use-cases for Pool.apply , Pool.apply_async and Pool.map . I am mainly using Pool.map ; what are the advantages of others?
...