Reflection is often used as part of software testing, such as for the runtime creation/instantiation of mock objects. It's also great for inspecting the state of an object at any given point in time. Here's an example of using Reflection in a unit test to verify a protected class member contains the...
The first two arguments to format are an output stream and a control string. Basic use does not require additional arguments. Passing t as the stream writes to *standard-output*.
> (format t "Basic Message")
Basic Message
nil
That expression will write Basic Message to standard ou...
main = do
input <- getContents
putStr input
Input:
This is an example sentence.
And this one is, too!
Output:
This is an example sentence.
And this one is, too!
Note: This program will actually print parts of the output before all of the input has been fully read in. This m...
readFloat :: IO Float
readFloat =
fmap read getLine
main :: IO ()
main = do
putStr "Type the first number: "
first <- readFloat
putStr "Type the second number: "
second <- readFloat
putStrLn $ show first ++ " + " ++ show se...
Like in several other parts of the I/O library, functions that implicitly use a standard stream have a counterpart in System.IO that performs the same job, but with an extra parameter at the left, of type Handle, that represents the stream being handled. For instance, getLine :: IO String has a cou...
To stop a running container:
docker stop <container> [<container>...]
This will send the main process in the container a SIGTERM, followed by a SIGKILL if it doesn't stop within the grace period. The name of each container is printed as it stops.
To start a container which is stoppe...
5
Treat a property as a combination of two functions, one to get the value from it, and another one to set the value in it.
The get property of the property descriptor is a function that will be called to retrieve the value from the property.
The set property is also a function, it will be call...
Syntax:
SELECT *
FROM table_name
Using the asterisk operator * serves as a shortcut for selecting all the columns in the table. All rows will also be selected because this SELECT statement does not have a WHERE clause, to specify any filtering criteria.
This would also work the same way if you...
At first glance it may appear that null and undefined are basically the same, however there are subtle but important differences.
undefined is the absence of a value in the compiler, because where it should be a value, there hasn't been put one, like the case of an unassigned variable.
undefined...
1 / 0; // Infinity
// Wait! WHAAAT?
Infinity is a property of the global object (therefore a global variable) that represents mathematical infinity. It is a reference to Number.POSITIVE_INFINITY
It is greater than any other value, and you can get it by dividing by 0 or by evaluating the express...
Many IDEs provide support for generating HTML from Javadocs automatically; some build tools (Maven and Gradle, for example) also have plugins that can handle the HTML creation.
However, these tools are not required to generate the Javadoc HTML; this can be done using the command line javadoc tool.
...
// Java:
String joined = things.stream()
.map(Object::toString)
.collect(Collectors.joining(", "));
// Kotlin:
val joined = things.joinToString() // ", " is used as separator, by default
Templates can be previewed and edited using the Rule Editor tab in Bosun. Use the Jump to links to select the alert you want to edit, then you can use the template button next to macro to switch between the alert an template sections of the configuration. If an alert has multiple instances you can u...
You can embed another template body into your template via {{template "mysharedtemplate" .}} to reuse shared components. Here is an example that creates a header template that can be reused at the top of all other template bodies. It also uses CSS to stylize the output so that it is easier...
When using GraphAll you may still want to filter the results, in which case you can use an Alert variable with the Filter, Sort, and Limit functions.
template graph.template {
subject = ...
body = `{{template "header" .}}
<strong>Graph Filtered Variable</strong...
