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What is an idempotent operation?
... once with the same input parameters. For example, removing an item from a set can be considered an idempotent operation on the set.
In mathematics, an idempotent operation is one where f(f(x)) = f(x). For example, the abs() function is idempotent because abs(abs(x)) = abs(x) for all x.
These sli...
Can I prevent the Firefox developer tools network panel from clearing on page reload?
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From Firefox 31 onwards you can use the "Enable persistent logs" setting to prevent the Network Monitor from clearing the list on reload.
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How to represent multiple conditions in a shell if statement?
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Classic technique (escape metacharacters):
if [ \( "$g" -eq 1 -a "$c" = "123" \) -o \( "$g" -eq 2 -a "$c" = "456" \) ]
then echo abc
else echo efg
fi
I've enclosed the references to $g in double quotes; that's good practice, in general. Strictly, the parentheses are...
Changes in import statement python3
...n Python 2, you could do it like this (in derived.py):
from base import BaseThing
Python 3 no longer supports that since it's not explicit whether you want the 'relative' or 'absolute' base. In other words, if there was a Python package named base installed in the system, you'd get the wrong one....
Placing border inside of div and not on its edge
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Set box-sizing property to border-box:
div {
box-sizing: border-box;
-moz-box-sizing: border-box;
-webkit-box-sizing: border-box;
width: 100px;
height: 100px;
border: 20px solid #f00;
b...
Wrap a delegate in an IEqualityComparer
...e the following type:
class Value
{
public string Name { get; private set; }
public int Number { get; private set; }
public Value(string name, int number)
{
Name = name;
Number = number;
}
public override string ToString()
{
return string.Format...
How to use enum values in f:selectItem(s)
...default (for example when you are editing a question then you have already set the status of the question to something)
– LuckyLuke
Nov 22 '11 at 17:18
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Giving UIView rounded corners
...iew should check out the CALayer class reference. Most of it is as easy as setting one or two property values, like the above answer: developer.apple.com/mac/library/documentation/GraphicsImaging/…
– Justin Searls
Feb 20 '10 at 17:05
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How to process each line received as a result of grep command
...that (because of the pipe) everything inside the loop is in a subshell, so setting variables defined outside the loop during the loop does not make their values available after the loop!
– David Doria
Jan 24 '14 at 15:50
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Node.js app can't run on port 80 even though there's no other process blocking the port
...s I suppose the best practice would be to run on a different port and just set up a port-forwarding rule as mentioned here: stackoverflow.com/questions/16573668/…
– AlexMA
Oct 8 '13 at 13:16
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