..:: 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 1304060 83184 ?       Ssl  Oct24 195:12 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11721912 138072 ?     Ssl  Oct24 336:34 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1305072 73740 ?       Ssl  Oct24 154:59 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.3  0.4 1304912 72224 ?       Ssl  Oct24 139:50 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.8 11846436 132724 ?     Ssl  Oct24 347:21 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.5 11810828 97596 ?      Ssl  Oct24 212:01 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.5 1329932 83384 ?       Ssl  Oct24 274:20 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1302764 71000 ?       Ssl  Oct24 141:55 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297184 65632 ?       Ssl  Oct24 140:10 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.2  2.7 12173524 451360 ?     Ssl  Oct24 1154:20 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.4  0.4 1167336 66324 ?       Ssl  Oct24 146:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.7  2.6 22613448 438308 ?     Ssl  Oct24 613:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.4  0.3 1099620 63772 ?       Ssl  Oct24 146:52 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.4  0.3 1098852 63352 ?       Ssl  Oct24 146:57 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.4  0.3 1099620 64104 ?       Ssl  Oct24 146:28 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.4  0.3 1099624 65024 ?       Ssl  Oct24 146:09 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.4  0.3 1099364 64212 ?       Ssl  Oct24 146:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.4  0.3 1100384 64840 ?       Ssl  Oct24 146:28 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.4  0.3 1100128 63676 ?       Ssl  Oct24 143:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.4  0.3 1099112 63552 ?       Ssl  Oct24 144:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.4  0.9 11849020 149728 ?     Ssl  Oct24 516:11 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data  895294  0.0  0.0   2608   596 ?        S    23:10   0:00 sh -c ps -aux | grep node
www-data  895296  0.0  0.0   3304   656 ?        S    23:10   0:00 grep node
sasa     2628167  0.9  0.7 1161800 117832 ?      Ssl  Nov04 176:14 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11811452 95400 ?      Ssl  Nov06 112:47 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.4  0.5 11798408 83184 ?      Ssl  Nov06  76:05 node /home/sasa/@mikosoft/dodo-examples/server/index.js