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String is immutable. What exactly is the meaning? [duplicate]
...be updated from outside without accessing them via methods), for example:
Foo x = new Foo("the field");
x.setField("a new field");
System.out.println(x.getField()); // prints "a new field"
While in an immutable class (declared as final, to prevent modification via inheritance)(its methods cannot ...
git rebase fatal: Needed a single revision
... that isn't the problem. I've gotten this error from trying to rebase onto foo when I had not yet created the branch to track origin/foo.
– cdunn2001
Nov 21 '11 at 16:46
add a...
Is there a better alternative than this to 'switch on type'?
...tract method on S that every subclass needs to implement.
Doing this the "foo" method can also change its signature to Foo(S o), making it type safe, and you don't need to throw that ugly exception.
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...
How can I count text lines inside an DOM element? Can I?
...ines: " + lines);
return lines;
}
countLines(document.getElementById("foo"));
div
{
padding:100px 0 10% 0;
background: pink;
box-sizing: border-box;
border:30px solid red;
}
<div id="foo">
x<br>
x<br>
x<br>
x<br>
</div>
...
How do I output raw html when using RazorEngine (NOT from MVC)
...ng in my TemplateBase class:
// Writes the results of expressions like: "@foo.Bar"
public virtual void Write(object value)
{
if (value is IHtmlString)
WriteLiteral(value);
else
WriteLiteral(AntiXssEncoder.HtmlEncode(value.ToString(), false));
}
// Writes literals like marku...
Elegant Python function to convert CamelCase to snake_case?
...;> from stringcase import pascalcase, snakecase
>>> snakecase('FooBarBaz')
'foo_bar_baz'
>>> pascalcase('foo_bar_baz')
'FooBarBaz'
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...
Qt: How do I handle the event of the user pressing the 'X' (close) button?
...our class definition and add your code into that function. Example:
class foo : public QMainWindow
{
Q_OBJECT
private:
void closeEvent(QCloseEvent *bar);
// ...
};
void foo::closeEvent(QCloseEvent *bar)
{
// Do something
bar->accept();
}
...
Return first match of Ruby regex
...
You can use []: (which is like match)
"foo+account2@gmail.com"[/\+([^@]+)/, 1] # matches capture group 1, i.e. what is inside ()
# => "account2"
"foo+account2@gmail.com"[/\+([^@]+)/] # matches capture group 0, i.e. the whole match
# => "+account2"
...
Get current stack trace in Ruby without raising an exception
...
You can use Kernel#caller:
# /tmp/caller.rb
def foo
puts caller # Kernel#caller returns an array of strings
end
def bar
foo
end
def baz
bar
end
baz
Output:
caller.rb:8:in `bar'
caller.rb:12:in `baz'
caller.rb:15:in `<main>'
...
Explanation of JSONB introduced by PostgreSQL
....ex. these are valid JSON representations: null, true, [1,false,"string",{"foo":"bar"}], {"foo":"bar","baz":[null]} - hstore is just a little subset compared to what JSON is capable (but if you only need this subset, it's fine).
The only difference between json & jsonb is their storage:
json ...