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What is meant by 'first class object'?
...
console.log(o.a); // 1
console.log(o.b); // 2
function foo(){};
foo.a = 3 ;
foo.b = 4 ;
console.log(foo.a); // logs 3
console.log(foo.b); // logs 4
Functions can be stored in a variable as a value.
var foo = function(){};
console.l...
C# Object Pooling Pattern implementation
...ing statement, so the object gets freed at the end.
using (PooledObject<Foo> pooledObject = SharedPools.Default<List<Foo>>().GetPooledObject())
{
// Do something with pooledObject.Object
}
// Example 2 - No using statement so you need to be sure no exceptions are not thrown.
L...
Why is list initialization (using curly braces) better than the alternatives?
...constructor can be either an initializer list or a plain old ctor.
struct Foo {
Foo() {}
Foo(std::initializer_list<Foo>) {
std::cout << "initializer list" << std::endl;
}
Foo(const Foo&) {
std::cout << "copy ctor" << std::endl;
...
How can I cast int to enum?
...
From an int:
YourEnum foo = (YourEnum)yourInt;
From a string:
YourEnum foo = (YourEnum) Enum.Parse(typeof(YourEnum), yourString);
// The foo.ToString().Contains(",") check is necessary for enumerations marked with an [Flags] attribute
if (!Enum....
How to have the cp command create any necessary folders for copying a file to a destination [duplica
... only reliable way to do this would be to combine mkdir and cp:
mkdir -p /foo/bar && cp myfile "$_"
As an aside, when you only need to create a single directory in an existing hierarchy, rsync can do it in one operation. I'm quite a fan of rsync as a much more versatile cp replacement, i...
What Are the Differences Between PSR-0 and PSR-4?
... part following the anchor point.
For example if you define that the Acme\Foo\ namespace is anchored in src/, with PSR-0 it means it will look for Acme\Foo\Bar in src/Acme/Foo/Bar.php while in PSR-4 it will look for it in src/Bar.php, allowing for shorter directory structures. On the other hand som...
How to get the list of properties of a class?
...on; for an instance:
obj.GetType().GetProperties();
for a type:
typeof(Foo).GetProperties();
for example:
class Foo {
public int A {get;set;}
public string B {get;set;}
}
...
Foo foo = new Foo {A = 1, B = "abc"};
foreach(var prop in foo.GetType().GetProperties()) {
Console.WriteLi...
jQuery object equality
... you can use .is. Below is the answer from over a year ago...
var a = $('#foo');
var b = a;
if (a.is(b)) {
// the same object!
}
If you want to see if two variables are actually the same object, eg:
var a = $('#foo');
var b = a;
...then you can check their unique IDs. Every time you cr...
When should I use “this” in a class?
...lue of the parameter "name" to the instance variable "name".
public class Foo
{
private String name;
public void setName(String name) {
this.name = name;
}
}
Case 2: Using this as an argument passed to another object.
public class Foo
{
public String useBarMethod() {
...
Copy constructor for a class with unique_ptr
.../some stuff
};
struct Derived : public Base
{
//some stuff
};
struct Foo
{
std::unique_ptr<Base> ptr; //points to Derived or some other derived class
};
... and the goal is, as said, to make Foo copiable.
For this, one needs to do a deep copy of the contained pointer to ensure th...