..:: Source code - 057wrapper_object.js ::..

/**
This code demonstrates that strings, numbers, and boolean
values behave like objects when you try to read the value of a property (or method)
from them. But if you attempt to set the value of a property, that attempt is silently
ignored: the change is made on a temporary object and does not persist.
The temporary objects created when you access a property of a string, number, or
boolean are known as wrapper objects, and it may occasionally be necessary to distin-
guish a string value from a String object or a number or boolean value from a Number
or Boolean object. 
 */

var s = "test"; //this is string

s.len = 4; //setting a property doesn't take effect

var t = s.len;
console.log(t); //returns undefined because s.len=4 doent work

 

..:: NodeJS Console - 057wrapper_object.js ::..

$ node 057wrapper_object.js
undefined
$ps -aux | grep node (list all node processes)
sasa        1194  0.4  0.5 1306852 86184 ?       Ssl   2025 1244:58 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305000 73072 ?       Ssl   2025 896:06 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.7  0.6 11831496 110096 ?     Ssl   2025 2020:09 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11817232 106052 ?     Ssl   2025 1417:52 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304664 73068 ?       Ssl   2025 909:26 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297836 67856 ?       Ssl   2025 894:30 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.5  2.8 12157920 469232 ?     Ssl   2025 11624:46 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.8  2.6 12100328 433260 ?     Ssl   2025 9722:49 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      356539  0.5  0.5 11807588 96688 ?      Ssl  Apr11  56:27 node /home/sasa/miko/miko-hr/server/index.js
sasa     1004233  0.3  0.6 22293412 106672 ?     Ssl  Apr17   6:36 node /home/sasa/dex8/dex8-worker/starter.js
www-data 1150051  0.0  0.0   2608   596 ?        S    12:46   0:00 sh -c ps -aux | grep node
www-data 1150053  0.0  0.0   3304   716 ?        S    12:46   0:00 grep node
sasa     1214480  0.3  0.7 22311168 125460 ?     Ssl   2025 621:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101312 65344 ?       Ssl   2025 543:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1102852 67592 ?       Ssl   2025 541:57 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1101800 66484 ?       Ssl   2025 545:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100548 64328 ?       Ssl   2025 543:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100928 65812 ?       Ssl   2025 541:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1100648 65076 ?       Ssl   2025 533:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100384 63492 ?       Ssl   2025 531:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.6  0.7 11709880 124900 ?     Ssl   2025 1072:49 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1100792 64440 ?       Ssl   2025 541:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2628167  0.8  0.8 1176920 132092 ?      Ssl   2025 2031:38 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11821304 104664 ?     Ssl   2025 1460:48 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 85096 ?      Ssl   2025 1206:56 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1332612 86708 ?       Ssl  Feb21 552:53 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js