Javascript constructor "this reference" Post: 303000786

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Top Forums Web Development Javascript constructor "this reference" Post 303000786 by yifangt on Wednesday 19th of July 2017 06:15:43 PM

07-19-2017

Registered User

Javascript constructor "this reference"

Hello,
I just came to the object part in JavaScript, which is the instance of the object can be iterated by the for-loop (or with-loop):

Code:

function Car(seat_sth, engine_sth, radio_sth) {
    this.seats = seat_sth;
    this.engine = engine_sth;
    this.radio = radio_sth;
}
var work_car = new Car("Leather", "V-6", "Cassette/Disc");
for (var propname in work_car) {
    document.write(propname + ":    " + work_car[propname] + "<br>")
}

Instead of iterating an instance of the object, is there a way to have object constructor to traverse all object members similar to "this reference" in C++/PERL?

Code:

function Car(seat_sth, engine_sth, radio_sth) {
    this.seats = seat_sth;
    this.engine = engine_sth;
    this.radio = radio_sth;
    this.describe = describe_car();
    }
function describe_car() {
    for (var propname in this) {
    document.write(propname + ":    " + this[propname] + "<br>")
    }
}

Just started JS, and not sure I am asking a right question. Thanks!

Last edited by yifangt; 07-19-2017 at 07:24 PM..

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mail::spf::base

Mail::SPF::Base(3)					User Contributed Perl Documentation					Mail::SPF::Base(3)

NAME

       Mail::SPF::Base - Base class for Mail::SPF classes

SYNOPSIS

	   use base 'Mail::SPF::Base';

	   sub new {
	       my ($class, @options) = @_;
	       my $self = $class->SUPER::new(@options);
	       ...
	       return $self;
	   }

DESCRIPTION

       Mail::SPF::Base is a common base class for all Mail::SPF classes.

   Constructor
       The following constructor is provided:

       new(%options): returns Mail::SPF::Base
	   Creates a new object of the class on which the constructor was invoked.  The provided options are stored as key/value pairs in the new
	   object.

	   The "new" constructor may also be called on an object, in which case the object is cloned.  Any options provided override those from
	   the old object.

	   There are no common options defined in Mail::SPF::Base.

   Class methods
       The following class methods are provided:

       class: returns string
	   Returns the class name of the class or object on which it is invoked.

   Class methods
       The following class methods are provided:

       make_accessor($name, $readonly): returns code-ref
	   Creates an accessor method in the class on which it is invoked.  The accessor has the given name and accesses the object field of the
	   same name.  If $readonly is true, the accessor is made read-only.

   Instance methods
       There are no common instance methods defined in Mail::SPF::Base.

SEE ALSO

       Mail::SPF

       For availability, support, and license information, see the README file included with Mail::SPF.

AUTHORS

       Julian Mehnle <julian@mehnle.net>, Shevek <cpan@anarres.org>

perl v5.12.1							    2010-07-05							Mail::SPF::Base(3)