..:: 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  0.4 1303224 81000 ?       Ssl  Oct24 241:29 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11722820 139656 ?     Ssl  Oct24 426:48 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1305852 73440 ?       Ssl  Oct24 195:39 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.3  0.4 1304912 73100 ?       Ssl  Oct24 172:38 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.6 11821604 99596 ?      Ssl  Oct24 419:30 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11813900 98968 ?      Ssl  Oct24 263:48 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.5 1330472 83672 ?       Ssl  Oct24 348:31 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1301044 69700 ?       Ssl  Oct24 175:25 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297912 66924 ?       Ssl  Oct24 173:06 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.2  2.8 12153204 459700 ?     Ssl  Oct24 1456:15 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.4  0.3 1166312 64728 ?       Ssl  Oct24 181:23 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.8  2.6 22644924 439660 ?     Ssl  Oct24 823:01 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.4  0.4 1102180 66312 ?       Ssl  Oct24 181:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.4  0.4 1102692 66464 ?       Ssl  Oct24 181:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.4 1102948 66772 ?       Ssl  Oct24 180:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.3  0.3 1100136 64712 ?       Ssl  Oct24 180:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.3  0.3 1100388 63772 ?       Ssl  Oct24 180:40 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.3  0.4 1102944 66560 ?       Ssl  Oct24 180:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.3  0.3 1101920 65380 ?       Ssl  Oct24 177:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.3  0.3 1100904 64992 ?       Ssl  Oct24 178:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.5  0.9 11854068 155192 ?     Ssl  Oct24 716:22 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     2628167  0.8  0.7 1167256 123176 ?      Ssl  Nov04 250:51 node /home/sasa/voovuu/voovuu-api/starter.js
www-data 2870295  0.0  0.0   2608   528 ?        S    23:40   0:00 sh -c ps -aux | grep node
www-data 2870297  0.0  0.0   3304   720 ?        S    23:40   0:00 grep node
sasa     3168557  0.6  0.5 11820492 95392 ?      Ssl  Nov06 173:15 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.4  0.5 11798408 83072 ?      Ssl  Nov06 113:45 node /home/sasa/@mikosoft/dodo-examples/server/index.js