..:: Source code - 053undefined_var.js ::..

/**
 * undefined cases
 */

//non initialized variable
var x;
console.log(x); //undefined


//function without parameter
function fja(y) { return y; }
console.log(fja());


//non existent property
var obj = {prop1: 'Some string'};
console.log(obj.prop2);

..:: NodeJS Console - 053undefined_var.js ::..

undefined
undefined
undefined

$ps -aux | grep node (list all node processes)
sasa         914  0.5  0.5 1306920 84736 ?       Ssl  Aug04 349:30 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         935  0.7  0.8 11786584 132244 ?     Ssl  Aug04 515:01 node /home/sasa/dex8/dex8-api/starter.js
sasa         938  0.4  0.4 1306780 76468 ?       Ssl  Aug04 297:14 node /home/sasa/regoch/regoch-www/server
sasa         945  0.3  0.4 1303752 71876 ?       Ssl  Aug04 252:29 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         947  0.7  0.6 11820120 109340 ?     Ssl  Aug04 513:17 node /home/sasa/dex8/dex8-www/server/index.js
sasa         966  0.5  0.6 11811792 99612 ?      Ssl  Aug04 389:38 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         980  0.8  0.5 1330216 83328 ?       Ssl  Aug04 536:10 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         997  0.3  0.4 1303104 71348 ?       Ssl  Aug04 255:19 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1021  0.3  0.3 1297448 64676 ?       Ssl  Aug04 251:31 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1065  0.6  0.6 11828292 108156 ?     Ssl  Aug04 428:51 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1074  0.6  0.6 1148752 104208 ?      Ssl  Aug04 418:37 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1136  0.7  1.0 11874676 172060 ?     Ssl  Aug04 485:21 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1148  0.4  0.4 11794644 77820 ?      Ssl  Aug04 278:54 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1197  0.3  0.3 1100140 63268 ?       Ssl  Aug04 260:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1199  0.4  0.4 22277756 78704 ?      Ssl  Aug04 264:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1308  0.3  0.3 1100128 63712 ?       Ssl  Aug04 259:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1325  0.3  0.3 1099616 63388 ?       Ssl  Aug04 259:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1393  0.8  0.8 22326264 146944 ?     Ssl  Aug04 527:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1395  0.3  0.3 1099884 63308 ?       Ssl  Aug04 260:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1489  0.3  0.3 1099872 63684 ?       Ssl  Aug04 260:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1496  0.3  0.3 1100640 65264 ?       Ssl  Aug04 258:59 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1100384 63912 ?       Ssl  Aug04 259:39 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1608  0.3  0.3 1099616 62772 ?       Ssl  Aug04 258:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1686  1.6  5.0 12556668 829640 ?     Ssl  Aug04 1097:18 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data 1015800  0.0  0.0   2608   528 ?        S    02:04   0:00 sh -c ps -aux | grep node
www-data 1015802  0.0  0.0   3304   656 ?        S    02:04   0:00 grep node
sasa     1371685  0.4  0.5 11809232 89620 ?      Ssl  Aug16 215:21 node /home/sasa/mikosoft-info/solar-wind-energy/server/index.js
sasa     1460918  0.4  0.3 1300136 65136 ?       Ssl  Aug17 213:43 node /home/sasa/sites-nodejs/oxygen-free-copper/server.js