大约有 47,000 项符合查询结果（耗时：0.0475秒） [XML]
Catching error codes in a shell pipe
...
If you really don't want the second command to proceed until the first is known to be successful, then you probably need to use temporary files. The simple version of that is:
tmp=${TMPDIR:-/tmp}/mine.$$
if ./a > $tmp.1
then
if ./b <$tmp.1 >$tmp.2
...
Reverse Range in Swift
...here for the bounds.
Earlier edit for Swift 1.2: As of Xcode 6 Beta 4, by and ReverseRange don't exist anymore :[
If you are just looking to reverse a range, the reverse function is all you need:
for i in reverse(1...5) { println(i) } // prints 5,4,3,2,1
As posted by 0x7fffffff there is a new s...
How ListView's recycling mechanism works
So I have this problem I had before, and naturally I asked for help on here . Luksprog's answer was great because I had no idea about how ListView and GridView optimized itself with recycling Views. So with his advice I was able to change how I added Views to my GridView. Problem is now I have some...
Most efficient method to groupby on an array of objects
...
Here is one that outputs array and not object: groupByArray(xs, key) { return xs.reduce(function (rv, x) { let v = key instanceof Function ? key(x) : x[key]; let el = rv.find((r) => r && r.key === v); ...
Javascript calculate the day of the year (1 - 366)
...
Edit: The code above will fail when now is a date in between march 26th and October 29th andnow's time is before 1AM (eg 00:59:59). This is due to the code not taking daylight savings time into account. You should compensate for this:
var now = new Date();
var start = new Date(now.getFullY...
How do I get the number of days between two dates in JavaScript?
...
Here is a quick and dirty implementation of datediff, as a proof of concept to solve the problem as presented in the question. It relies on the fact that you can get the elapsed milliseconds between two dates by subtracting them, which coerc...
How to determine equality for two JavaScript objects?
...ortant to determine whether any two instances of MyClass are equal, only a and b are important. In some cases c might vary between instances and yet not be significant during comparison.
Note this issue applies when members may themselves also be instances of a type and these each would all be req...
Is an array name a pointer?
...ame a pointer in C?
If not, what is the difference between an array's name and a pointer variable?
10 Answers
...
Differences between git remote update and fetch?
...etch Documentation/RelNotes/* | less
Then I did a less search for --all, and this is what I found under the release notes for Git version 1.6.6:
git fetch learned --all and --multiple options, to run fetch from many repositories, and --prune option to remove remote tracking branches that went ...
Finding duplicate values in MySQL
I have a table with a varchar column, and I would like to find all the records that have duplicate values in this column. What is the best query I can use to find the duplicates?
...