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Best way to clear a PHP array's values
...o simply re-instantiate it using
$foo = array(); // $foo is still here
If you want something more powerful use unset since it also will clear $foo from the symbol table, if you need the array later on just instantiate it again.
unset($foo); // $foo is gone
$foo = array(); // $foo is here again
...
Convert light frequency to RGB?
...(double Wavelength) {
double factor;
double Red, Green, Blue;
if((Wavelength >= 380) && (Wavelength < 440)) {
Red = -(Wavelength - 440) / (440 - 380);
Green = 0.0;
Blue = 1.0;
} else if((Wavelength >= 440) && (Wavelength < 490)) {
...
Can one AngularJS controller call another?
...rvice)
{
// has a reference to the same instance of the service
// so if the service updates state for example, this controller knows about it
}
Another way is emitting an event on scope:
function FirstController($scope)
{
$scope.$on('someEvent', function(event, args) {});
// another co...
How to search file text for a pattern and replace it with a given value
...ooking for a script to search a file (or list of files) for a pattern and, if found, replace that pattern with a given value.
...
Running bash script from within python
...
The shell=True parameter is not needed (under a Posix system like Linux) if the first line of the bash script is a path to a shell; for example, #!/bin/bash.
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Flatten an irregular list of lists
...boost the performance.
Python 2
def flatten(l):
for el in l:
if isinstance(el, collections.Iterable) and not isinstance(el, basestring):
for sub in flatten(el):
yield sub
else:
yield el
I used the Iterable ABC added in 2.6.
Python 3
I...
How to use protractor to check if an element is visible?
I'm trying to test if an element is visible using protractor. Here's what the element looks like:
8 Answers
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Android: How can I get the current foreground activity (from a service)?
...e activity, with a low-priority BroadcastReceiver as backup (to raise a Notification if the activity is not on-screen) -- here is a blog post with more on this pattern
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What is the best way to check for Internet connectivity using .NET?
...y, no reason to pull the 4KB back - just use client.OpenRead(url) instead. If it doesn't throw an exception then it was able to connect.
– Josh M.
Mar 27 '11 at 16:50
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How can I lock a file using java (if possible)
...an I prevent another (Java) process from opening this file, or at least notify that second process that the file is already opened? Does this automatically make the second process get an exception if the file is open (which solves my problem) or do I have to explicitly open it in the first process w...