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How to detect if multiple keys are pressed at once using JavaScript?
... a time, an array is created to keep track of multiple keys. The array can then be used to check for one or more keys at once.
Just to explain, let's say you press A and B, each fires a keydown event that sets map[e.keyCode] to the value of e.type == keydown, which evaluates to either true or false....
If i synchronized two methods on the same class, can they run simultaneously?
...and t2 on same object tries to call methodA() and methodB() simultaneously then only 1 (say t1) thread will execute and the other thread has to wait until t1 releases lock ?
– sreeprasad
May 3 '15 at 21:15
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What generates the “text file busy” message in Unix?
...revalent in System V R3 or thereabouts a good couple of decades ago. Back then, it meant that you could not change a program executable while it was running.
For example, I was building a make workalike called rmk, and after a while it was self-maintaining. I would run the development version and...
Repeat String - Javascript
...ed an algorithm for this exact problem which was widely adapted, modified, then eventually poorly understood and forgotten. To remedy this issue, in August, 2008 I published an article http://www.webreference.com/programming/javascript/jkm3/3.html explaining the algorithm and using it as an example ...
How to make a programme continue to run after log out from ssh? [duplicate]
...
Assuming that you have a program running in the foreground, press ctrl-Z, then:
[1]+ Stopped myprogram
$ disown -h %1
$ bg 1
[1]+ myprogram &
$ logout
If there is only one job, then you don't need to specify the job number. Just use disown -h and bg.
Explanation of the abov...
In which order do CSS stylesheets override?
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Then there's no specific rule as to in what order stylesheets load? I understand how CSS displays in terms of specificity, but then I'll assume my master sheet will load unless overridden.
– ian5v
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What is the difference between Amazon SNS and Amazon SQS?
...y isn't what you want. You'd probably want one queue for each service that then handles user-specific messages. This diagram may help: aws.amazon.com/blogs/aws/…
– Trenton
Jul 28 '15 at 16:27
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MongoDB Show all contents from all collections
...ction
db.getCollection(collections[i]).find().forEach(printjson); //and then print the json of each of its elements
}
I think this script might get what you want. It prints the name of each collection and then prints its elements in json.
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POST Content-Length exceeds the limit
...ng a new php5-fpm instance but my webserver was still using the old one, I then had to do sudo killall -KILL php5-fpm then sudo service php5-fpm start
– Memes
May 11 '16 at 8:29
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Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...malization uses rsqrt followed by an iteration of newton-raphson, which is then very accurate and still faster than 1/ssqrt!
– Brandon Pelfrey
Jun 24 '12 at 15:29
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