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Accessing outside variable using anonymous function as params
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@machineaddict The basic use is early binding - if you mean workaround for late binding - you would pass the variable through use by reference - using & => use (&$result) and alter $result variable before you call the anonymous function (or something, that calls...
Add EBS to Ubuntu EC2 Instance
...ar device number):
sudo mkfs.ext4 /dev/xvdf
Only format the file system if this is a new volume with no data on it. Formatting will make it difficult or impossible to retrieve any data that was on this volume previously.
Mount file system (with update to /etc/fstab so it stays mounted on reboot):...
Numpy array dimensions
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@wim more specifically property is a class. In the case of class properties (a property you put in your class), they are objects of type property exposed as an attribute of the class. An attribute, in python, is the name following the dot....
CATALINA_OPTS vs JAVA_OPTS - What is the difference?
I was trying to find out the difference between Apache Tomcat variables - CATALINA_OPTS and JAVA_OPTS in SO and surprised to see that there is no question/answer posted here yet. So I thought of sharing it here (with answer) after finding out the difference. Check the answer/difference below...
MySQL table is marked as crashed and last (automatic?) repair failed
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If your MySQL process is running, stop it. On Debian:
sudo service mysql stop
Go to your data folder. On Debian:
cd /var/lib/mysql/$DATABASE_NAME
Try running:
myisamchk -r $TABLE_NAME
If that doesn't work, you can tr...
JSON.stringify output to div in pretty print way
I JSON.stringify a json object by
12 Answers
12
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How SignalR works internally?
...nection supported by server and client (you can also force it to use a specific transport).
That's the high level. If you want to see how each transport is implemented, you can look at the source code.
There's also client code for each transport:
https://github.com/SignalR/SignalR/tree/master/src...
POST data with request module on Node.JS
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Remember to JSON.stringify your data if you are sending 'content-type': 'application/json'
– Derek Soike
Mar 25 '19 at 19:10
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How to prepend a string to a column value in MySQL?
... the CONCAT function to do that:
UPDATE tbl SET col=CONCAT('test',col);
If you want to get cleverer and only update columns which don't already have test prepended, try
UPDATE tbl SET col=CONCAT('test',col)
WHERE col NOT LIKE 'test%';
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Get HTML5 localStorage keys
...ter each iteration. i++ and ++i both have the exact same effect on i. The difference is that ++i evaluates to the new value of i after incrementing, whereas i++ evaluates to the value of i before incrementing. It makes absolutely no difference here, because all we care about is the side-effect of in...