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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
Old 07-19-2017
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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JavaScript::Packer(3pm) 				User Contributed Perl Documentation				   JavaScript::Packer(3pm)

NAME
JavaScript::Packer - Perl version of Dean Edwards' Packer.js VERSION
Version 1.006003 DESCRIPTION
A JavaScript Compressor This module is an adaptation of Dean Edwards' Packer.js. Additional information: http://dean.edwards.name/packer/ SYNOPSIS
use JavaScript::Packer; my $packer = JavaScript::Packer->init(); $packer->minify( $javascript, $opts ); To return a scalar without changing the input simply use (e.g. example 2): my $ret = $packer->minify( $javascript, $opts ); For backward compatibility it is still possible to call 'minify' as a function: JavaScript::Packer::minify( $javascript, $opts ); The first argument must be a scalarref of javascript-code. Second argument must be a hashref of options. Possible options are: compress Defines compression level. Possible values are 'clean', 'shrink', 'obfuscate' and 'best'. Default value is 'clean'. 'best' uses 'shrink' or 'obfuscate' depending on which result is shorter. This is recommended because especially when compressing short scripts the result will exceed the input if compression level is 'obfuscate'. copyright You can add a copyright notice at the top of the script. remove_copyright If there is a copyright notice in a comment it will only be removed if this option is set to a true value. Otherwise the first comment that contains the word "copyright" will be added at the top of the packed script. A copyright comment will be overwritten by a copyright notice defined with the copyright option. no_compress_comment If not set to a true value it is allowed to set a JavaScript comment that prevents the input being packed or defines a compression level. /* JavaScript::Packer _no_compress_ */ /* JavaScript::Packer shrink */ EXAMPLES
Example 1 Common usage. #!/usr/bin/perl use strict; use warnings; use JavaScript::Packer; my $packer = JavaScript::Packer->init(); open( UNCOMPRESSED, 'uncompressed.js' ); open( COMPRESSED, '>compressed.js' ); my $js = join( '', <UNCOMPRESSED> ); $packer->minify( $js, { compress => 'best' } ); print COMPRESSED $js; close(UNCOMPRESSED); close(COMPRESSED); Example 2 A scalar is requested by the context. The input will remain unchanged. #!/usr/bin/perl use strict; use warnings; use JavaScript::Packer; my $packer = JavaScript::Packer->init(); open( UNCOMPRESSED, 'uncompressed.js' ); open( COMPRESSED, '>compressed.js' ); my $uncompressed = join( '', <UNCOMPRESSED> ); my $compressed = $packer->minify( $uncompressed, { compress => 'best' } ); print COMPRESSED $compressed; close(UNCOMPRESSED); close(COMPRESSED); AUTHOR
Merten Falk, "<nevesenin at cpan.org>" BUGS
Please report any bugs or feature requests through the web interface at http://github.com/nevesenin/javascript-packer-perl/issues <http://github.com/nevesenin/javascript-packer-perl/issues>. SUPPORT
You can find documentation for this module with the perldoc command. perldoc JavaScript::Packer COPYRIGHT &; LICENSE Copyright 2008 - 2012 Merten Falk, all rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.14.2 2012-03-02 JavaScript::Packer(3pm)
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