..:: 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 1304332 82524 ?       Ssl   2025 841:29 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305000 73556 ?       Ssl   2025 600:04 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.7 11828076 117868 ?     Ssl   2025 1342:22 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11817836 105108 ?     Ssl   2025 949:01 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.5 1331116 85080 ?       Ssl   2025 1306:37 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1304152 72148 ?       Ssl   2025 609:54 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298284 68332 ?       Ssl   2025 599:12 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  2.9 12185156 487348 ?     Ssl   2025 7106:59 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.0  1.5 11947424 259460 ?     Ssl   2025 4779:05 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.4  0.7 22311424 126564 ?     Ssl   2025 289:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1102848 66908 ?       Ssl   2025 226:52 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1102084 68068 ?       Ssl   2025 226:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1101288 64956 ?       Ssl   2025 227:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.4 1102340 66368 ?       Ssl   2025 226:40 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1101952 67304 ?       Ssl   2025 226:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.4 1102952 67228 ?       Ssl   2025 222:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1099360 62356 ?       Ssl   2025 222:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.8  0.7 11709576 124216 ?     Ssl   2025 550:12 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1101816 65812 ?       Ssl   2025 225:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2107342  0.3  0.4 1100892 66592 ?       Ssl  03:03   3:29 node /home/sasa/dex8/dex8-worker/starter.js
www-data 2208816  0.0  0.0   2608   592 ?        S    20:09   0:00 sh -c ps -aux | grep node
www-data 2208818  0.0  0.0   3304   716 ?        S    20:09   0:00 grep node
sasa     2628167  0.9  0.7 1175876 130956 ?      Ssl   2025 1302:42 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11801576 90700 ?      Ssl   2025 926:39 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 84928 ?      Ssl   2025 731:35 node /home/sasa/@mikosoft/dodo-examples/server/index.js