..:: 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 1304976 84384 ?       Ssl   2025 970:46 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305000 73324 ?       Ssl   2025 695:43 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.7 11834776 115812 ?     Ssl   2025 1545:14 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11820144 107924 ?     Ssl   2025 1100:30 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304664 73108 ?       Ssl   2025 706:28 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1302472 70204 ?       Ssl   2025 694:33 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.6  3.1 12203388 513544 ?     Ssl   2025 8715:02 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.1  1.8 11987576 299604 ?     Ssl   2025 5938:08 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      258049  0.3  0.4 1102688 67312 ?       Ssl  03:02   3:57 node /home/sasa/dex8/dex8-worker/starter.js
www-data  363196  0.0  0.0   2608   592 ?        S    22:28   0:00 sh -c ps -aux | grep node
www-data  363198  0.0  0.0   3304   712 ?        S    22:28   0:00 grep node
sasa     1214480  0.4  0.7 22311424 125760 ?     Ssl   2025 396:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1100800 64396 ?       Ssl   2025 328:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1100804 65836 ?       Ssl   2025 327:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1100776 65084 ?       Ssl   2025 330:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100548 64436 ?       Ssl   2025 328:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100672 65748 ?       Ssl   2025 327:51 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.4 1102440 66068 ?       Ssl   2025 323:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1102432 65960 ?       Ssl   2025 321:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11708552 125040 ?     Ssl   2025 719:14 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1100536 64524 ?       Ssl   2025 327:22 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2509059  0.6  0.5 11803056 93776 ?      Ssl  Feb14 162:45 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1177432 133140 ?      Ssl   2025 1546:10 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11812048 95904 ?      Ssl   2025 1095:23 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 83928 ?      Ssl   2025 885:27 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1330464 83040 ?       Ssl  Feb21  98:48 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js