大约有 11,287 项符合查询结果（耗时：0.0272秒） [XML]
Return multiple values to a method caller
I read the C++ version of this question but didn't really understand it.
27 Answers
...
Sorting an array of objects by property values
I've got the following objects using AJAX and stored them in an array:
30 Answers
30
...
Scala: Abstract types vs generics
I was reading A Tour of Scala: Abstract Types . When is it better to use abstract types?
4 Answers
...
How can I verify if one list is a subset of another?
I need to verify if a list is a subset of another - a boolean return is all I seek.
15 Answers
...
Split delimited strings in a column and insert as new rows [duplicate]
...
Here is another way of doing it..
df <- read.table(textConnection("1|a,b,c\n2|a,c\n3|b,d\n4|e,f"), header = F, sep = "|", stringsAsFactors = F)
df
## V1 V2
## 1 1 a,b,c
## 2 2 a,c
## 3 3 b,d
## 4 4 e,f
s <- strsplit(df$V2, split = ",")
data.frame(V1 = ...
Laravel 4 Eloquent Query Using WHERE with OR AND OR?
How do I say WHERE (a = 1 OR b =1 ) AND (c = 1 OR d = 1)
11 Answers
11
...
Pandas conditional creation of a series/dataframe column
I have a dataframe along the lines of the below:
8 Answers
8
...
Does Java support default parameter values?
... complicated. For other methods, renaming some cases or using a parameter object can help. This is when you have enough complexity that differentiating is difficult. A definite case is where you have to differentiate using the order of parameters, not just number and type.
...
How to check command line parameter in “.bat” file?
My OS is Windows Vista. I need to have a ".bat" file where I need to check if user enters any command-line parameter or not. If does then if the parameter equals to -b then I will do something otherwise I will flag "Invalid input". If user does not enter any command-line parameter then I will d...
Multiple variables in a 'with' statement?
Is it possible to declare more than one variable using a with statement in Python?
6 Answers
...