大约有 42,000 项符合查询结果（耗时：0.0533秒） [XML]
Count number of objects in list [closed]
...'s put some stuff in it - 3 components/indexes/tags (whatever you want to call it) each with differing amounts of elements:
> mylist <- list(record1=c(1:10),record2=c(1:5),record3=c(1:2))
If you are interested in just the number of components in a list use:
> length(mylist)
[1] 3
...
Convert List into Comma-Separated String
..., 4, 5 })
String.Join will take a list as a the second parameter and join all of the elements using the string passed as the first parameter into one single string.
share
|
improve this answer
...
Interview question: Check if one string is a rotation of other string [closed]
...
@Jon Concentrate on s1+s1. Clearly, all of its substrings with size s1.length are rotations of s1, by construction. Therefore, any string of size s1.length that is a substring of s1+s1 must be a rotation of s1.
– Daniel C. Sobral
...
NOT IN vs NOT EXISTS
...be the same at the moment but if either column is altered in the future to allow NULLs the NOT IN version will need to do more work (even if no NULLs are actually present in the data) and the semantics of NOT IN if NULLs are present are unlikely to be the ones you want anyway.
When neither Products...
Difference between window.location.href, window.location.replace and window.location.assign
...
@Mitya IMHO assign() is better, calling a function for a side effect is more readable. Also you can easily mock it for testing.
– Mohamed Ramrami
Sep 14 at 15:08
...
Parsing JSON with Unix tools
...
There are a number of tools specifically designed for the purpose of manipulating JSON from the command line, and will be a lot easier and more reliable than doing it with Awk, such as jq:
curl -s 'https://api.github.com/users/lambda' | jq -r '.name'
You can...
CA2202, how to solve this case
Can anybody tell me how to remove all CA2202 warnings from the following code?
12 Answers
...
What's the difference between .so, .la and .a library files?
...t in memory). But what is the difference between .a and .la ? Are these all static libraries?
1 Answer
...
SQL Server query - Selecting COUNT(*) with DISTINCT
In SQL Server 2005 I have a table cm_production that lists all the code that's been put into production. The table has a ticket_number, program_type, and program_name and push_number along with some other columns.
...
Get the first item from an iterable that matches a condition
...ment against next (in that answer) is that you must handle an exception; really ?
– Abraham TS
Jan 24 '18 at 23:34
My ...