..:: 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 1305352 84748 ?       Ssl   2025 1493:35 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1304744 70972 ?       Ssl   2025 1063:17 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11824420 103240 ?     Ssl   2025 1680:17 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1310848 75084 ?       Ssl   2025 1078:25 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298092 67100 ?       Ssl   2025 1061:54 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  2.6 12137184 434544 ?     Ssl   2025 13753:11 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  4.9  3.4 12226368 567032 ?     Ssl   2025 15089:51 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      978713  0.3  0.3 1099100 63792 ?       Ssl  04:03   1:55 node /home/sasa/dex8/dex8-worker/starter.js
www-data 1021248  0.0  0.0   2608   592 ?        S    14:00   0:00 sh -c ps -aux | grep node
www-data 1021250  0.0  0.0   3304   644 ?        S    14:00   0:00 grep node
sasa     1214480  0.3  0.7 22311168 125316 ?     Ssl   2025 808:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1101568 65896 ?       Ssl   2025 721:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101060 65888 ?       Ssl   2025 719:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1102056 66988 ?       Ssl   2025 725:09 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1101316 65236 ?       Ssl   2025 721:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.3 1100672 65508 ?       Ssl   2025 719:18 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166184 65016 ?       Ssl   2025 709:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1101152 65928 ?       Ssl   2025 706:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11845468 127180 ?     Ssl   2025 1543:40 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1101304 65140 ?       Ssl   2025 718:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.9 11857712 161156 ?     Ssl  Apr20 420:06 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1904154  0.5  1.3 11933552 227688 ?     Ssl  Apr25 260:21 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.7 1176408 130856 ?      Ssl   2025 2418:40 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11825976 100136 ?     Ssl   2025 1772:29 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 84452 ?      Ssl   2025 1474:00 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332492 86412 ?       Ssl  Feb21 945:16 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js