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Which MySQL data type to use for storing boolean values
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For MySQL 5.0.3 and higher, you can use BIT. The manual says:
As of MySQL 5.0.3, the BIT data type is used to store bit-field
values. A type of BIT(M) enables storage of M-bit values. M can range
from 1 to 64.
Otherwise, according to t...
How to check if a variable is an integer in JavaScript?
...the === operator (strict equality) as below,
if (data === parseInt(data, 10))
alert("data is integer")
else
alert("data is not an integer")
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Get decimal portion of a number with JavaScript
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Use 1, not 2.
js> 2.3 % 1
0.2999999999999998
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What is AssemblyInfo.cs used for?
...tab of the file properties you will see no name,
no description, version 0.0.0.0, etc.
The value associated with assembly:Guid is the ID that will identify
the assembly if it will be exposed as a COM object. So, if your
assembly isn't COM-exposed, you don't need this. It is randomly
gen...
How can I auto increment the C# assembly version via our CI platform (Hudson)?
...ementing assembly version numbers and we frequently ship assemblies with 1.0.0.0 versions. Obviously, this causes a lot of headaches.
...
Can I set an opacity only to the background image of a div?
...ndex: 1;
}
.myDiv .bg {
position: absolute;
z-index: -1;
top: 0;
bottom: 0;
left: 0;
right: 0;
background: url(test.jpg) center center;
opacity: .4;
width: 100%;
height: 100%;
}
See test case on jsFiddle
:before and ::before pseudo-element
Another trick i...
Convert a number range to another range, maintaining ratio
...) + NewMin
Or if you want to protect for the case where the old range is 0 (OldMin = OldMax):
OldRange = (OldMax - OldMin)
if (OldRange == 0)
NewValue = NewMin
else
{
NewRange = (NewMax - NewMin)
NewValue = (((OldValue - OldMin) * NewRange) / OldRange) + NewMin
}
Note that in this...
rotating axis labels in R
...re's an example:
require(grDevices)
tN <- table(Ni <- stats::rpois(100, lambda=5))
r <- barplot(tN, col=rainbow(20), las=1)
That represents the style of axis labels. (0=parallel, 1=all horizontal, 2=all perpendicular to axis, 3=all vertical)
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How to get the first element of an array?
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like this
alert(ary[0])
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GroupBy pandas DataFrame and select most common value
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