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How expensive is the lock statement?
I've been experimenting with multi threading and parallel processing and I needed a counter to do some basic counting and statistic analysis of the speed of the processing. To avoid problems with concurrent use of my class I've used a lock statement on a private variable in my class:
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How to play a local video with Swift?
... should add it using the plus button
3. Code
Open your View Controller and write this code.
import UIKit
import AVKit
import AVFoundation
class ViewController: UIViewController {
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
playVideo()
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Having options in argparse with a dash
...e pm . How can I get around this issue? Is it possible to have - in command line options?
3 Answers
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What does “@” mean in Windows batch scripts
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It means not to output the respective command. Compare the following two batch files:
@echo foo
and
echo foo
The former has only foo as output while the latter prints
H:\Stuff>echo foo
foo
(here, at least). As can be seen the command that is run is visib...
Counting array elements in Python [duplicate]
...index of array? for example, when I'm looping that array, i get some index and how to know how much index is in?
– isnaini barochatun
May 9 at 13:06
add a comment
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How can I create and style a div using JavaScript?
How can I use JavaScript to create and style (and append to the page) a div, with content?
I know it's possible, but how?
9...
Using “like” wildcard in prepared statement
I am using prepared statements to execute mysql database queries. And I want to implement a search functionality based on a keyword of sorts.
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Block Comments in a Shell Script
...fore comment
: <<'END'
bla bla
blurfl
END
echo after comment
The ' and ' around the END delimiter are important, otherwise things inside the block like for example $(command) will be parsed and executed.
For an explanation, see this and this question.
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“Templates can be used only with field access, property access, single-dimension array index, or sin
...he error message.
You are trying to pass in a method chain to be executed and it doesn't like it.
This is a perfect example of where the MVVM (Model-View-ViewModel) pattern comes in handy.
You could wrap up your Trainer model class in another class called TrainerViewModel that could work somethin...
Why does int num = Integer.getInteger(“123”) throw NullPointerException?
... variation of this problem was featured in Return of the Puzzlers: Schlock and Awe (TS-5186), Josh Bloch and Neal Gafter's 2009 JavaOne Technical Session presentation. Here's the concluding slide:
The Moral
Strange and terrible methods lurk in libraries
Some have innocuous soundi...