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How do I check if an array includes a value in JavaScript?
...y frameworks also offer similar methods:
jQuery: $.inArray(value, array, [fromIndex])
Underscore.js: _.contains(array, value) (also aliased as _.include and _.includes)
Dojo Toolkit: dojo.indexOf(array, value, [fromIndex, findLast])
Prototype: array.indexOf(value)
MooTools: array.indexOf(value)
Moc...
Is there a standard sign function (signum, sgn) in C/C++?
... ints, floats, doubles, unsigned shorts, or any custom types constructible from integer 0 and orderable.
Fast! copysign is slow, especially if you need to promote and then narrow again. This is branchless and optimizes excellently
Standards-compliant! The bitshift hack is neat, but only works for so...
Updating version numbers of modules in a multi-module Maven project
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Use versions:set from the versions-maven plugin:
mvn versions:set -DnewVersion=2.50.1-SNAPSHOT
It will adjust all pom versions, parent versions and dependency versions in a multi-module project.
If you made a mistake, do
mvn versions:rev...
Templated check for the existence of a class member function?
...st thing, I use expression SFINAE to exclude the serialize(_imp) functions from overload resolution, if the first expression inside decltype isn't valid (aka, the function doesn't exist).
The void() is used to make the return type of all those functions void.
The 0 argument is used to prefer the o...
How to center icon and text in a android button with width set to “fill parent”
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android:drawableLeft is always keeping android:paddingLeft as a distance from the left border. When the button is not set to android:width="wrap_content", it will always hang to the left!
With Android 4.0 (API level 14) you can use android:drawableStart attribute to place a drawable at the start ...
Understanding typedefs for function pointers in C
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Consider the signal() function from the C standard:
extern void (*signal(int, void(*)(int)))(int);
Perfectly obscurely obvious - it's a function that takes two arguments, an integer and a pointer to a function that takes an integer as an argument and retu...
Simple and fast method to compare images for similarity
... contribute an img_hash module to opencv_contrib, you can find the details from this link.
img_hash module provide six image hash algorithms, quite easy to use.
Codes example
origin lena
blur lena
resize lena
shift lena
#include <opencv2/core.hpp>
#include <opencv2/core/ocl.hpp>
...
Custom Adapter for List View
... == null) {
LayoutInflater vi;
vi = LayoutInflater.from(mContext);
v = vi.inflate(resourceLayout, null);
}
Item p = getItem(position);
if (p != null) {
TextView tt1 = (TextView) v.findViewById(R.id.id);
TextView tt...
jQuery pass more parameters into callback
... What is the purpose of 'var doSomething = '? How is this different from just declaring doSomething as a function (ie function doSomething(...) {} )
– Dave Neeley
Sep 23 '10 at 18:33
...
moveCamera with CameraUpdateFactory.newLatLngBounds crashes
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Warning for this method, from the docs: "This event will not fire if the map never loads due to connectivity issues, or if the map is continuously changing and never completes loading due to the user constantly interacting with the map." (emphasis mi...