..:: 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 1304868 84080 ?       Ssl  Oct24 488:10 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  1.0  0.8 11723376 138572 ?     Ssl  Oct24 869:58 node /home/sasa/dex8/dex8-api/starter.js
sasa        1208  0.4  0.4 1305000 73848 ?       Ssl  Oct24 352:06 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.7 11853216 118568 ?     Ssl  Oct24 831:20 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.6 11811596 99216 ?      Ssl  Oct24 554:35 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.9  0.5 1330860 84372 ?       Ssl  Oct24 752:24 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1304920 73212 ?       Ssl  Oct24 358:14 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.4  0.4 1298260 66592 ?       Ssl  Oct24 351:49 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.9  2.7 12148348 450540 ?     Ssl  Oct24 3340:53 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.4  0.3 1232104 64520 ?       Ssl  Oct24 370:05 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.4  0.3 1100900 65320 ?       Ssl  Oct24 369:30 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.4  0.3 1100900 65052 ?       Ssl  Oct24 370:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.4  0.3 1100900 64676 ?       Ssl  Oct24 369:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.4  0.4 1101928 66668 ?       Ssl  Oct24 368:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.4  0.3 1101668 65156 ?       Ssl  Oct24 368:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.4  0.4 1168224 66816 ?       Ssl  Oct24 369:23 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.4  0.3 1101408 64540 ?       Ssl  Oct24 360:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.4  0.3 1100136 64236 ?       Ssl  Oct24 362:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  2.5  1.0 11871844 174880 ?     Ssl  Oct24 2091:40 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      400948  0.3  0.3 1099100 64004 ?       Ssl  03:02   2:31 node /home/sasa/dex8/dex8-worker/starter.js
www-data  449498  0.0  0.0   2608   588 ?        S    15:12   0:00 sh -c ps -aux | grep node
www-data  449500  0.0  0.0   3304   716 ?        S    15:12   0:00 grep node
sasa     2628167  1.0  0.8 1175656 132448 ?      Ssl  Nov04 685:46 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.7  0.5 11813328 97344 ?      Ssl  Nov06 496:35 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 83000 ?      Ssl  Nov06 341:00 node /home/sasa/@mikosoft/dodo-examples/server/index.js