..:: 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 1305556 83544 ?       Ssl   2025 1450:02 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1304488 71768 ?       Ssl   2025 1031:31 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11825572 108128 ?     Ssl   2025 1629:50 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304920 72720 ?       Ssl   2025 1046:04 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298516 68536 ?       Ssl   2025 1030:08 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.5  2.9 12180136 490496 ?     Ssl   2025 13419:01 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  4.6  3.4 12221668 565536 ?     Ssl   2025 13864:50 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      212912  0.3  0.4 1102432 66260 ?       Ssl  04:03   1:45 node /home/sasa/dex8/dex8-worker/starter.js
www-data  252146  0.0  0.0   2608   528 ?        S    13:08   0:00 sh -c ps -aux | grep node
www-data  252148  0.0  0.0   3304   720 ?        S    13:08   0:00 grep node
sasa     1214480  0.3  0.7 22311168 125264 ?     Ssl   2025 773:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1102080 65760 ?       Ssl   2025 687:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101316 66316 ?       Ssl   2025 686:01 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1101288 66020 ?       Ssl   2025 691:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.4 1101316 65784 ?       Ssl   2025 687:39 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100928 66932 ?       Ssl   2025 685:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166184 65268 ?       Ssl   2025 675:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1099872 63812 ?       Ssl   2025 673:22 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.8 11845212 131644 ?     Ssl   2025 1487:50 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1101816 66288 ?       Ssl   2025 685:03 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.7 11828088 116608 ?     Ssl  Apr20 346:19 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1904154  0.6  0.6 11829500 107108 ?     Ssl  Apr25 203:03 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.7 1176152 130404 ?      Ssl   2025 2348:01 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11822536 98044 ?      Ssl   2025 1714:46 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 84472 ?      Ssl   2025 1423:13 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332492 86364 ?       Ssl  Feb21 872:04 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js