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How to listen for changes to a MongoDB collection?
...some tricks. The key here is the oplog.
When you run MongoDB in a Replica Set, all of the MongoDB actions are logged to an operations log (known as the oplog). The oplog is basically just a running list of the modifications made to the data. Replicas Sets function by listening to changes on this op...
How can I open a Shell inside a Vim Window?
...an open a shell by using the :shell command in Vim, however I can't edit a file and at the same time use the shell.
10 Answ...
Remove last item from array
I have the following array.
25 Answers
25
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Pythonic way to create a long multi-line string
I have a very long query. I would like to split it in several lines in Python. A way to do it in JavaScript would be using several sentences and joining them with a + operator (I know, maybe it's not the most efficient way to do it, but I'm not really concerned about performance in this stage, jus...
What Makes a Method Thread-safe? What are the rules?
...eparate thread
// could have changed its value between this thread setting its value at the start
// of the method and this line reading its value.
number = this.someValue.Length;
return number;
}
}
You should be aware that any parameters passed in to the metho...
How to calculate a Mod b in Casio fx-991ES calculator
...(instead of traditional d/c).
How to switch display mode to ab/c:
Go to settings (Shift + Mode).
Press arrow down (to view more settings).
Select ab/c (number 1).
Now do your calculation (in comp mode), like 50 / 3 and you will see 16 2/3, thus, mod is 2. Or try 54 / 7 which is 7 5/7 (mod is 5)...
What is the Windows equivalent of the diff command?
...r linux commands that you can use from the windows command line.
You can set the PATH variable by right clicking on Computer and selecting Properties. Then you can click on Advanced System Settings on the left side of the screen. In the pop up, click Environment Variables and then either add or up...
Reading a delimited string into an array in Bash
... -a arr <<< "$line"
No globbing problem; the split character is set in $IFS, variables quoted.
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Using CSS :before and :after pseudo-elements with inline CSS?
...a pseudo element in a stylesheet, then there's a way to style it inline by setting an inline style to its parent element, and then using inherit keyword to style the pseudo element, like this:
<parent style="background-image:url(path/to/file); background-size:0px;"></p>
<style>
...
Exception.Message vs Exception.ToString()
...essage (doh) associated with the exception. Example:
Object reference not set to an instance of an object
The Exception.ToString() method will give a much more verbose output, containing the exception type, the message (from before), a stack trace, and all of these things again for nested/inner ex...