大约有 41,200 项符合查询结果（耗时：0.0492秒） [XML]
How do you run multiple programs in parallel from a bash script?
...
psmearspsmears
20.2k44 gold badges3434 silver badges4747 bronze badges
54
...
Java 8 NullPointerException in Collectors.toMap
...
13 Answers
13
Active
...
Can you do greater than comparison on a date in a Rails 3 search?
I have this search in Rails 3:
4 Answers
4
...
Converting JavaScript object with numeric keys into array
...
328
It's actually very straight forward with jQuery's $.map
var arr = $.map(obj, function(el) { r...
Determining complexity for recursive functions (Big O notation)
...
362
The time complexity, in Big O notation, for each function:
int recursiveFun1(int n)
{
if ...
Gem::LoadError for mysql2 gem, but it's already in Gemfile
...ith rails 4.1.5) try using this version of mysql2:
gem 'mysql2', '~> 0.3.18'
Apparently mysql2 isn't still compatible with newer version of rails because rails 4.2.4 is pretty new as the time of answering this question by me 8 September 2015 so use the above line in your Gem file and run:
bu...
In CMake, how can I test if the compiler is Clang?
...also work correctly if a compiler wrapper like ccache is used.
As of CMake 3.0.0 the CMAKE_<LANG>_COMPILER_ID value for Apple-provided Clang is now AppleClang. To test for both the Apple-provided Clang and the regular Clang use the following if condition:
if (CMAKE_CXX_COMPILER_ID MATCHES "Cla...
Access lapply index names inside FUN
...uments to the function, so the following works:
x <- list(a=11,b=12,c=13) # Changed to list to address concerns in commments
lapply(seq_along(x), function(y, n, i) { paste(n[[i]], y[[i]]) }, y=x, n=names(x))
Here I use lapply over the indices of x, but also pass in x and the names of x. As you...
How to read and write excel file
I want to read and write an Excel file from Java with 3 columns and N rows, printing one string in each cell. Can anyone give me simple code snippet for this? Do I need to use any external lib or does Java have built-in support for it?
...