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Ruby, !! operator (a/k/a the double-bang) [duplicate]
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So basically, !!foo is equivalent to not (foo == nil or foo == false)
– FloatingRock
Mar 30 '17 at 15:43
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What is a covariant return type?
...ct. You could override this in your own class as follows:
public class MyFoo
{
...
// Note covariant return here, method does not just return Object
public MyFoo clone()
{
// Implementation
}
}
The benefit here is that any method which holds an explicit reference to a MyF...
Where is the syntax for TypeScript comments documented?
...dmap
Current
TypeScript uses JSDoc. e.g.
/** This is a description of the foo function. */
function foo() {
}
To learn jsdoc : https://jsdoc.app/
But you don't need to use the type annotation extensions in JSDoc.
You can (and should) still use other jsdoc block tags like @returns etc.
Example
Jus...
What are all the differences between src and data-src attributes?
...EG for you and displays it:
<img id="myImage" src="http://mydomain.com/foo.jpg">
<script>
var imageUrl = document.getElementById("myImage").src;
</script>
Example of 'data-src' on a non-image tag where the image is not loaded yet - it's just a piece of meta data on the div ...
git pull aborted with error filename too long
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@cchamberlain C:/foo/bar/baz is perfectly valid, though while \foo\bar\baz is also valid (it will refer to whatever logical drive the current working directory is on) /foo/bar/baz may cause ambiguity with command-line flags.
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Xcode 4 - build output directory
... to do wacky stuff to find the app.
xcodebuild -sdk "iphoneos" -workspace Foo.xcworkspace -scheme Foo -configuration "Debug" DEPLOYMENT_LOCATION=YES DSTROOT=tmp DWARF_DSYM_FOLDER_PATH=tmp build
share
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Can I use GDB to debug a running process?
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Yes you can. Assume a process foo is running...
ps -elf | grep foo
look for the PID number
gdb -a {PID number}
share
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improve this answer
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Running V8 Javascript Engine Standalone
...> ./v8-shell
V8 version 2.0.2
> var x = 10;
> x
10
> function foo(x) { return x * x; }
> foo
function foo(x) { return x * x; }
> quit()
Executing Javascript from the command line:
$> ./v8-shell -e 'print("10*10 = " + 10*10)'
10*10 = 100
Many more features are documented i...
Javascript sort array by two fields
...8
}, {
LastName: "Doe",
FirstName: "Jane",
Age: 28
}, {
LastName: "Foo",
FirstName: "John",
Age: 30
}];
arr.sortBy("LastName", true, "FirstName", true, "Age", false);
//Will return Jane Doe / John Doe / John Foo
arr.sortBy("Age", false, "LastName", true, "FirstName", false);
//Will ret...
How can I configure Logback to log different levels for a logger to different destinations?
...der">
<target>System.out</target>
<filter class="com.foo.StdOutFilter" />
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</appender>
<appender name="stderr" class="ch.qos.logback.core.ConsoleAppender">
<target>System.err</target>
<filter class="com.foo.ErrOutFilter" />
...
<...