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Batch files - number of command line arguments
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Googling a bit gives you the following result from wikibooks:
set argC=0
for %%x in (%*) do Set /A argC+=1
echo %argC%
Seems like cmd.exe has evolved a bit from the old DOS days :)
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Access denied for user 'root@localhost' (using password:NO)
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You can reset your root password. Have in mind that it is not advisable to use root without password.
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How do I set the version information for an existing .exe, .dll?
As part of our build process I need to set the version information for all of our compiled binaries. Some of the binaries already have version information (added at compile time) and some do not.
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What is this: [Ljava.lang.Object;?
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Are GUID collisions possible?
...^19 chance of any two GUIDs colliding depends on how many GUIDs are in the set. For that chance you need ~2^32 GUIDs, so in nearly all real-world scenarios the odds are much lower.
– DocMax
Oct 9 '08 at 7:16
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Why is creating a Thread said to be expensive?
The Java tutorials say that creating a Thread is expensive. But why exactly is it expensive? What exactly is happening when a Java Thread is created that makes its creation expensive? I'm taking the statement as true, but I'm just interested in mechanics of Thread creation in JVM.
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Clicking the text to select corresponding radio button
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How to get an array of unique values from an array containing duplicates in JavaScript? [duplicate]
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Edited
ES6 solution:
[...new Set(a)];
Alternative:
Array.from(new Set(a));
Old response. O(n^2) (do not use it with large arrays!)
var arrayUnique = function(a) {
return a.reduce(function(p, c) {
if (p.indexOf(c) < 0) p.push(c);
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Delete last commit in bitbucket
...itbucket branches.
If you're trying to change a non-master branch:
git reset HEAD^ # remove the last commit from the branch history
git push origin :branch_name # delete the branch from bitbucket
git push origin branch_name # push the branch back up again, without the last commit
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记一次MongoDB性能问题 - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...nning on a NUMA machine. We suggest launching mongod like this to avoid performance problems: numactl –interleave=all mongod [other options]
当时我并不太清楚NUMA是什么东西，所以没有处理，只是把问题反馈给了运维人员，后来知道运维人员也没有理会这...