Editing Constructor (object-oriented programming) (section)

== Syntax ==
* [[Java (programming language)|Java]], [[C++]], [[C Sharp (programming language)|C#]], [[ActionScript]], {{nowrap|[[PHP]] 4}}, and [[MATLAB]] have a naming convention in which constructors have the same name as the class with which they are associated.
* In PHP 5, a recommended name for a constructor is <code>__construct</code>. For backwards compatibility, a method with the same name as the class will be called if <code>__construct</code> method can not be found. Since PHP 5.3.3, this works only for non-namespaced classes.<ref name="php5cpnstructor">[http://www.php.net/manual/en/language.oop5.decon.php Constructors and Destructors], from PHP online documentation</ref>
* In PHP 7, you should always name the constructor as <code>__construct</code>. Methods with the same name as the class will trigger an E_DEPRECATED level error.<ref name="php5cpnstructor"/>
* In [[Perl]], constructors are, by convention, named "new" and have to do a fair amount of object creation.
* In [[Moose perl|Moose object system]] for Perl, constructors (named ''new'') are automatically created and are extended by specifying a ''BUILD'' method.
* In [[Visual Basic .NET]], the constructor is called "<code>New</code>".
* In [[Python (programming language)|Python]], the constructor is split over two methods, "<code>__new__</code>" and "<code>__init__</code>". The <code>__new__</code> method is responsible for allocating memory for the instance, and receives the class as an argument (conventionally called "<code>cls</code>"). The <code>__init__</code> method (often called "the initialiser") is passed the newly created instance as an argument (conventionally called "<code>self</code>").<ref>[https://docs.python.org/3/reference/datamodel.html#basic-customization Data model], from Python online documentation</ref>
* [[Object Pascal]] constructors are signified by the keyword "<code>constructor</code>" and can have user-defined names (but are mostly called "<code>Create</code>").
* In [[Objective-C]], the constructor method is split across two methods, "<code>alloc</code>" and "<code>init</code>" with the <code>alloc</code> method setting aside (allocating) memory for an instance of the class, and the <code>init</code> method handling the bulk of initializing the instance. A call to the method "<code>new</code>" invokes both the <code>alloc</code> and the <code>init</code> methods, for the class instance.