..:: 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        1208  0.3  0.4 1305256 72268 ?       Ssl   2025 1220:16 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11823156 103684 ?     Ssl   2025 1928:06 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1302536 69900 ?       Ssl   2025 1236:52 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298092 67188 ?       Ssl   2025 1218:20 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.3  2.9 12245056 483216 ?     Ssl   2025 15425:53 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  5.9  3.5 12247472 582884 ?     Ssl   2025 21424:17 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      775160  0.3  0.4 1101408 65840 ?       Ssl  04:02   3:30 node /home/sasa/dex8/dex8-worker/starter.js
www-data  860599  0.0  0.0   2608   532 ?        S    22:01   0:00 sh -c ps -aux | grep node
www-data  860601  0.0  0.0   3304   720 ?        S    22:01   0:00 grep node
sasa     1214480  0.3  0.7 22311168 125752 ?     Ssl   2025 983:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101312 64972 ?       Ssl   2025 888:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1102340 67600 ?       Ssl   2025 886:39 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1102824 67364 ?       Ssl   2025 893:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1101316 64764 ?       Ssl   2025 888:57 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.3 1100672 65240 ?       Ssl   2025 886:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166184 64808 ?       Ssl   2025 876:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1102432 66916 ?       Ssl   2025 873:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.6  0.7 11844700 123984 ?     Ssl   2025 1819:48 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1101816 66096 ?       Ssl   2025 885:52 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.6 11818044 113244 ?     Ssl  Apr20 826:40 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1631573  0.4  0.5 1303916 82368 ?       Ssl  May31 184:48 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1904154  0.6  0.9 11867812 151840 ?     Ssl  Apr25 575:06 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1177564 132600 ?      Ssl   2025 2762:26 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11828056 103200 ?     Ssl   2025 2080:41 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799488 84508 ?      Ssl   2025 1726:22 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332680 87284 ?       Ssl  Feb21 1300:40 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js