..:: 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  0.5  0.5 1306896 85088 ?       Ssl  Aug04 345:10 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         935  0.7  0.8 11786584 132228 ?     Ssl  Aug04 510:02 node /home/sasa/dex8/dex8-api/starter.js
sasa         938  0.4  0.4 1307036 76544 ?       Ssl  Aug04 293:31 node /home/sasa/regoch/regoch-www/server
sasa         945  0.3  0.4 1303752 71264 ?       Ssl  Aug04 249:35 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         947  0.7  0.6 11822004 109492 ?     Ssl  Aug04 507:58 node /home/sasa/dex8/dex8-www/server/index.js
sasa         966  0.5  0.5 11808976 97968 ?      Ssl  Aug04 385:04 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         980  0.8  0.5 1330216 82932 ?       Ssl  Aug04 529:27 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         997  0.3  0.4 1303104 71180 ?       Ssl  Aug04 252:23 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1021  0.3  0.3 1297448 65152 ?       Ssl  Aug04 248:39 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1065  0.6  0.6 11835356 114488 ?     Ssl  Aug04 423:59 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1074  0.6  0.6 1148752 104320 ?      Ssl  Aug04 413:46 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1136  0.7  0.9 11854964 150804 ?     Ssl  Aug04 480:02 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1148  0.4  0.4 11794644 77748 ?      Ssl  Aug04 275:39 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1197  0.3  0.3 1100140 63960 ?       Ssl  Aug04 257:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1199  0.4  0.4 22277756 77860 ?      Ssl  Aug04 261:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1308  0.3  0.3 1099872 64024 ?       Ssl  Aug04 256:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1325  0.3  0.3 1099360 63532 ?       Ssl  Aug04 256:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1393  0.8  0.8 22325752 146680 ?     Ssl  Aug04 524:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1395  0.3  0.3 1099628 63460 ?       Ssl  Aug04 257:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1489  0.3  0.3 1099872 63068 ?       Ssl  Aug04 257:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1496  0.3  0.3 1100640 64768 ?       Ssl  Aug04 256:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1099616 63428 ?       Ssl  Aug04 256:40 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1608  0.3  0.3 1100128 62844 ?       Ssl  Aug04 255:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1686  1.5  5.0 12559996 827000 ?     Rsl  Aug04 985:09 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data  978011  0.0  0.0   2608   524 ?        S    16:11   0:00 sh -c ps -aux | grep node
www-data  978013  0.0  0.0   3304   712 ?        R    16:11   0:00 grep node
sasa     1371685  0.4  0.5 11799868 87868 ?      Ssl  Aug16 212:12 node /home/sasa/mikosoft-info/solar-wind-energy/server/index.js
sasa     1460918  0.4  0.3 1300136 65136 ?       Ssl  Aug17 210:26 node /home/sasa/sites-nodejs/oxygen-free-copper/server.js