..:: 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         914  0.4  0.5 1307156 84748 ?       Ssl  Aug04 237:43 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         935  0.6  0.8 11787352 132836 ?     Ssl  Aug04 356:35 node /home/sasa/dex8/dex8-api/starter.js
sasa         938  0.3  0.4 1306076 74448 ?       Ssl  Aug04 196:36 node /home/sasa/regoch/regoch-www/server
sasa         945  0.3  0.4 1303752 70588 ?       Ssl  Aug04 172:52 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         947  0.6  0.6 11833876 112672 ?     Ssl  Aug04 357:26 node /home/sasa/dex8/dex8-www/server/index.js
sasa         966  0.5  0.6 11809488 99796 ?      Ssl  Aug04 263:41 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         980  0.6  0.5 1330076 83092 ?       Ssl  Aug04 350:58 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         997  0.3  0.4 1301280 69840 ?       Ssl  Aug04 174:26 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1021  0.3  0.3 1297448 64784 ?       Ssl  Aug04 172:03 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1065  0.5  0.6 11815136 98720 ?      Ssl  Aug04 293:42 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1074  0.5  0.6 1149184 104912 ?      Ssl  Aug04 284:08 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1136  0.6  1.0 11867508 169592 ?     Ssl  Aug04 329:38 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1148  0.3  0.4 11794644 77948 ?      Ssl  Aug04 189:55 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1197  0.3  0.3 1099884 62776 ?       Ssl  Aug04 178:03 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1199  0.3  0.4 22277756 77760 ?      Ssl  Aug04 179:40 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1308  0.3  0.3 1100128 63584 ?       Ssl  Aug04 177:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1325  0.3  0.3 1099616 63532 ?       Ssl  Aug04 177:30 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1393  0.7  0.8 22314752 133596 ?     Ssl  Aug04 376:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1395  0.3  0.3 1100140 63544 ?       Ssl  Aug04 178:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1489  0.3  0.3 1099872 62860 ?       Ssl  Aug04 178:05 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1496  0.3  0.3 1100640 64908 ?       Ssl  Aug04 177:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1099872 63764 ?       Ssl  Aug04 177:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1608  0.3  0.3 1099872 63120 ?       Ssl  Aug04 176:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1686  0.8  0.9 11870440 158028 ?     Ssl  Aug04 423:49 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1371685  0.3  0.5 11801256 87312 ?      Ssl  Aug16 128:14 node /home/sasa/mikosoft-info/solar-wind-energy/server/index.js
sasa     1460918  0.3  0.3 1299880 65344 ?       Ssl  Aug17 124:47 node /home/sasa/sites-nodejs/oxygen-free-copper/server.js
www-data 4058282  0.0  0.0   2608   592 ?        S    08:11   0:00 sh -c ps -aux | grep node
www-data 4058284  0.0  0.0   3304   656 ?        S    08:11   0:00 grep node