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Testing the type of a DOM element in JavaScript
Is there a way to test the type of an element in JavaScript?
7 Answers
7
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Circle line-segment collision detection algorithm?
...e ray,
L is the end point of the ray,
C is the center of sphere you're testing against
r is the radius of that sphere
Compute:
d = L - E ( Direction vector of ray, from start to end )
f = E - C ( Vector from center sphere to ray start )
Then the intersection is found by..
Plugging:
P = E ...
Why does Node.js' fs.readFile() return a buffer instead of string?
I'm trying to read the content of test.txt (which is on the same folder of the Javascript source) and display it using this code:
...
Check if a given key already exists in a dictionary
I wanted to test if a key exists in a dictionary before updating the value for the key.
I wrote the following code:
16 Answ...
What are all the uses of an underscore in Scala?
...ses of the underscore is Scala _ [underscore] magic.
Examples:
def matchTest(x: Int): String = x match {
case 1 => "one"
case 2 => "two"
case _ => "anything other than one and two"
}
expr match {
case List(1,_,_) => " a list with three element and the first elem...
Remove the last three characters from a string
...
string test = "abcdxxx";
test = test.Remove(test.Length - 3);
//output : abcd
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In the shell, what does “ 2>&1 ” mean?
...
echo test > afile.txt
redirects stdout to afile.txt. This is the same as doing
echo test 1> afile.txt
To redirect stderr, you do:
echo test 2> afile.txt
>& is the syntax to redirect a stream to another file...
Can I set variables to undefined or pass undefined as an argument?
...tion statement lists, the unpassed arguments are set to undefined. You can test for that with eg.:
function dosomething(arg1, arg2) {
if (arg2===undefined)
arg2= DEFAULT_VALUE_FOR_ARG2;
...
}
With this method you can't tell the difference between dosomething(1) and dosomething(1, unde...
Where is the list of predefined Maven properties
...ow the XPath as a . delimited property.
So, for example:
${project.build.testOutputDirectory} == ${project.build.directory}/test-classes
And:
${project.build.directory} == ${project.basedir}/target
Thus combining them, we find:
${project.build.testOutputDirectory} == ${project.basedir}/tar...
Override Java System.currentTimeMillis for testing time sensitive code
...ncy injection, but even if you used a replaceable singleton you would gain testability.
This could almost be automated with search and replace for the singleton version:
Replace Calendar.getInstance() with Clock.getInstance().getCalendarInstance().
Replace new Date() with Clock.getInstance().newD...