..:: 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  0.5  0.5 1304260 83140 ?       Ssl   2025 926:36 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1304232 72300 ?       Ssl   2025 663:13 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.7 11829912 119844 ?     Ssl   2025 1472:51 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11817840 105332 ?     Ssl   2025 1049:07 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304920 72820 ?       Ssl   2025 673:39 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298668 68904 ?       Ssl   2025 662:03 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  3.2 12236540 537836 ?     Ssl   2025 8055:30 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.0  1.6 11955032 263060 ?     Ssl   2025 5528:23 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.4  0.7 22311424 126372 ?     Ssl   2025 360:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1100800 64876 ?       Ssl   2025 294:07 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1100804 65608 ?       Ssl   2025 293:18 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1100520 64856 ?       Ssl   2025 295:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100548 64692 ?       Ssl   2025 293:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100928 66088 ?       Ssl   2025 293:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1100136 63684 ?       Ssl   2025 289:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100128 63672 ?       Ssl   2025 287:59 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11708296 123188 ?     Ssl   2025 661:30 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1100280 64084 ?       Ssl   2025 292:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2509059  0.6  0.5 11802204 93296 ?      Ssl  Feb14  98:58 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1176900 132000 ?      Ssl   2025 1458:34 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11824592 100140 ?     Ssl   2025 1038:34 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 85084 ?      Ssl   2025 833:09 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.5  0.5 1330464 83284 ?       Ssl  Feb21  34:57 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa     3621630  0.3  0.4 1102688 67060 ?       Ssl  03:06   3:52 node /home/sasa/dex8/dex8-worker/starter.js
www-data 3703300  0.0  0.0   2608   528 ?        S    22:27   0:00 sh -c ps -aux | grep node
www-data 3703302  0.0  0.0   3304   644 ?        S    22:27   0:00 grep node