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How to determine if a type implements a specific generic interface type
...from TcKs it can also be done with the following LINQ query:
bool isBar = foo.GetType().GetInterfaces().Any(x =>
x.IsGenericType &&
x.GetGenericTypeDefinition() == typeof(IBar<>));
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What is the 'dynamic' type in C# 4.0 used for?
...ithout having to cast it.
dynamic cust = GetCustomer();
cust.FirstName = "foo"; // works as expected
cust.Process(); // works as expected
cust.MissingMethod(); // No method found!
Notice we did not need to cast nor declare cust as type Customer. Because we declared it dynamic, the runtime takes o...
Should struct definitions go in .h or .c file?
...to look inside struct s, while still allowing it to e.g. compile struct s *foo; (as long as foo is not later dereferenced).
Compare these versions of api.h and api.c:
Definition in header: Definition in implementation:
+---------------------------------+ +------------------------...
?: operator (the 'Elvis operator') in PHP
... left operand is truthy, and the right operand otherwise.
In pseudocode,
foo = bar ?: baz;
roughly resolves to
foo = bar ? bar : baz;
or
if (bar) {
foo = bar;
} else {
foo = baz;
}
with the difference that bar will only be evaluated once.
You can also use this to do a "self-check"...
How to create a checkbox with a clickable label?
...c variables do you like?</legend>
<input type="checkbox" name="foo" value="bar" id="foo_bar">
<label for="foo_bar">Bar</label>
<input type="checkbox" name="foo" value="baz" id="foo_baz">
<label for="foo_baz">Baz</label>
</fieldset>
...
When should the volatile keyword be used in C#?
...fully constructed object:
Thread 1 asks if a variable is null.
//if(this.foo == null)
Thread 1 determines the variable is null, so enters a lock.
//lock(this.bar)
Thread 1 asks AGAIN if the variable is null.
//if(this.foo == null)
Thread 1 still determines the variable is null, so it calls a const...
Passing just a type as a parameter in C#
...ic T GetColumnValue<T>(this string columnName){...} then you can say foo.GetColumnValues<string>(dm.mainColumn)
– Joshua G
Jun 4 '14 at 15:56
...
Reverse of JSON.stringify?
I'm stringyfing an object like {'foo': 'bar'}
8 Answers
8
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`static` keyword inside function?
...n their state. So be careful when writing OOP code.
Consider this:
class Foo
{
public function call()
{
static $test = 0;
$test++;
echo $test . PHP_EOL;
}
}
$a = new Foo();
$a->call(); // 1
$a->call(); // 2
$a->call(); // 3
$b = new Foo();
$b->c...
Why does Javascript's regex.exec() not always return the same value? [duplicate]
...ore matches by performing the assignment as the loop condition.
var re = /foo_(\d+)/g,
str = "text foo_123 more text foo_456 foo_789 end text",
match,
results = [];
while (match = re.exec(str))
results.push(+match[1]);
DEMO: http://jsfiddle.net/pPW8Y/
If you don't like the pla...