To read an atom's value, simply put the name of the atom, with a @ before it:
@counter ; => 0
A bigger example:
(def number (atom 3))
(println (inc @number))
;; This should output 4
There are two commands to change an atom, swap! and reset!. swap! is given commands, and changes the atom based on its current state. reset! changes the atom's value completely, regardless of what the original atom's value was:
(swap! counter inc) ; => 1
(reset! counter 0) ; => 0
This e...
WKWebView resizes the fonts on web content so that a full-sized web page will fit on the device's form factor. If you want the web text in both portrait and landscape to be similar in size to the user's preferred reading size, you need to set it explicitly.
Swift
// build HTML header for dynamic t...
First Execute
CREATE EXTENSION DBLINK;
Then
INSERT INTO
<SCHEMA_NAME>.<TABLE_NAME_1>
SELECT *
FROM
DBLINK(
'HOST=<IP-ADDRESS> USER=<USERNAME> PASSWORD=<PASSWORD> DBNAME=<DATABASE>',
'SELECT * FROM <SCHEMA_NAME>.<TABLE_NAME_2...
A very useful and logical follow-up to histograms and density plots would be the Empirical Cumulative Distribution Function. We can use the function ecdf() for this purpose. A basic plot produced by the command
plot(ecdf(rnorm(100)),main="Cumulative distribution",xlab="x")
wo...
Apache JMeter segregated all the components into following groups based on their functionality:
Test Plan: Starting point for scripting. JMeter saves the Test Plan in .jmx format. You add components to the Test Plan by Right Click on the Test Pand and navigating to the component you want to add.
...
Device can be rotate by changing orientation in XCUIDevice.shared().orientation:
XCUIDevice.shared().orientation = .landscapeLeft
XCUIDevice.shared().orientation = .portrait
To generate key pairs using different algorithms and key sizes:
final KeyPairGenerator dhGenerator = KeyPairGenerator.getInstance("DiffieHellman");
final KeyPairGenerator dsaGenerator = KeyPairGenerator.getInstance("DSA");
final KeyPairGenerator rsaGenerator = KeyPairGenerator...
To compute a signature:
final PrivateKey privateKey = keyPair.getPrivate();
final byte[] data = "FOO BAR".getBytes();
final Signature signer = Signature.getInstance("SHA1withRSA");
signer.initSign(privateKey);
signer.update(data);
final byte[] signature = signer.sign();...
QGraphics can be used to organize complicated scenes of visual objects into a framework that makes them easier to handle.
There are three major types of objects used in this framework QGraphicsView, QGraphicsScene, and QGraphicsItems. QGraphicsItems are the basic visual items that exist in the scen...
Usually, services call remote Api to retrieve/send data. But unit tests shouldn't do network calls. Angular internally uses XHRBackend class to do http requests. User can override this to change behavior. Angular testing module provides MockBackend and MockConnection classes which can be used to tes...
'Note: I use this method to extract non-html data in extracted GET telnet results
'This example effectively grabs every other vehicle that have start and finish
'characters, which in this case is "/".
'Resulting in an array like this:
'extractedData(0) = "/Jeep"
'extractedD...
When the last command in an interactive bash instance is done, the evaluated PS1 variable is displayes. Before actually displaying PS1 bash looks whether the PROMPT_COMMAND is set. This value of this var must be a callable program or script. If this var is set this program/script is called BEFORE th...
This example covers some advanced features and use-cases for Exceptions.
Examining the callstack programmatically
Java SE 1.4
The primary use of exception stacktraces is to provide information about an application error and its context so that the programmer can diagnose and fix the problem. Som...
The whole point of MVVM is to separate layers containing logic from the view layer.
On Android we can use the DataBinding Library to help us with this and make most of our logic Unit-testable without worrying about Android dependencies.
In this example I'll show the central components for a stupid...
