..:: 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 1305176 83484 ?       Ssl   2025 629:31 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305000 73912 ?       Ssl   2025 456:27 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.6 11830828 112740 ?     Ssl   2025 1050:37 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.6 11816476 104688 ?     Ssl   2025 720:20 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.5 1331116 84208 ?       Ssl   2025 986:54 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1303640 72400 ?       Ssl   2025 464:33 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297580 66784 ?       Ssl   2025 455:50 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.1  2.7 12152700 457956 ?     Ssl   2025 4816:23 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  2.7  1.1 11889364 194568 ?     Ssl   2025 3153:48 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.4 1101448 67120 ?       Ssl   2025  74:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1101312 66740 ?       Ssl   2025  74:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101572 67440 ?       Ssl   2025  73:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1101800 66588 ?       Ssl   2025  74:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.4 1101828 66780 ?       Ssl   2025  73:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1101440 66564 ?       Ssl   2025  73:52 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1099368 64652 ?       Ssl   2025  72:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1099104 63496 ?       Ssl   2025  72:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.5  0.7 11703940 118868 ?     Ssl   2025 119:40 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1101048 66644 ?       Ssl   2025  73:38 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2628167  0.9  0.8 1178272 132272 ?      Ssl   2025 941:32 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     2766216  0.3  0.3 1099488 64636 ?       Ssl  03:03   3:09 node /home/sasa/dex8/dex8-worker/starter.js
www-data 2834404  0.0  0.0   2608   592 ?        S    18:19   0:00 sh -c ps -aux | grep node
www-data 2834406  0.0  0.0   3304   716 ?        R    18:19   0:00 grep node
sasa     3168557  0.7  0.5 11811412 94620 ?      Ssl   2025 677:22 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 84732 ?      Ssl   2025 501:19 node /home/sasa/@mikosoft/dodo-examples/server/index.js