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How does “cat
...gn multi-line string to a shell variable
$ sql=$(cat <<EOF
SELECT foo, bar FROM db
WHERE foo='baz'
EOF
)
The $sql variable now holds the new-line characters too. You can verify with echo -e "$sql".
2. Pass multi-line string to a file in Bash
$ cat <<EOF > print.sh
#!/bin/bash
e...
TypeLoadException says 'no implementation', but it is implemented
...nting that method. The following code illustrates that:
public interface IFoo
{
void DoFoo();
}
public class Foo : IFoo
{
public void DoFoo() { Console.WriteLine("This is _not_ the interface method."); }
void IFoo.DoFoo() { Console.WriteLine("This _is_ the interface method."); }
}
Foo...
How do I show the changes which have been staged?
...lly the case with any git explanation). If you have local modifications to foo.c and do not perform git add foo.c, then foo.c is not in the index; it is not staged for commit. If git diff foo.c naively compared to the working foo.c to the index, then it would have to show a giant diff between an emp...
When to encode space to plus (+) or %20?
...ded content, such as the query part of a URL:
http://www.example.com/path/foo+bar/path?query+name=query+value
In this URL, the parameter name is query name with a space and the value is query value with a space, but the folder name in the path is literally foo+bar, not foo bar.
%20 is a valid wa...
How do I go straight to template, in Django's urls.py?
...h
from django.views.generic import TemplateView
urlpatterns = [
path('foo/', TemplateView.as_view(template_name='foo.html'))
]
https://docs.djangoproject.com/en/2.0/ref/class-based-views/base/#templateview
Django 1.5+
Use the class based generic views.
from django.views.generic import Temp...
Is there a way to create a function from a string with javascript?
...
Dynamic function names in JavaScript
Using Function
var name = "foo";
// Implement it
var func = new Function("return function " + name + "(){ alert('hi there!'); };")();
// Test it
func();
// Next is TRUE
func.name === 'foo'
Source: http://marcosc.com/2012/03/dynamic-function-names-in-...
Why is “using namespace std;” considered bad practice?
... performance at all. But consider this: you are using two libraries called Foo and Bar:
using namespace foo;
using namespace bar;
Everything works fine, and you can call Blah() from Foo and Quux() from Bar without problems. But one day you upgrade to a new version of Foo 2.0, which now offers a f...
Why do I need to override the equals and hashCode methods in Java?
...hcode, like HashMap and Set. Let's say we have a class like:
public class Foo {
String id;
String whatevs;
Foo(String id, String whatevs) {
this.id = id;
this.whatevs = whatevs;
}
}
We create two instances with the same id:
Foo a = new Foo("id", "something");
Foo...
Command line to remove an environment variable from the OS level configuration
...o remove the variable from the current environment (not permanently):
set FOOBAR=
To permanently remove the variable from the user environment (which is the default place setx puts it):
REG delete HKCU\Environment /F /V FOOBAR
If the variable is set in the system environment (e.g. if you origi...
What is Type-safe?
...s, Trying to put an integer in a string
String one = 1;
// Also fails.
int foo = "bar";
This also applies to method arguments, since you are passing explicit types to them:
int AddTwoNumbers(int a, int b)
{
return a + b;
}
If I tried to call that using:
int Sum = AddTwoNumbers(5, "5");
T...