..:: 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 ::..

$ node 053undefined_var.js
undefined
undefined
undefined
$ps -aux | grep node (list all node processes)
sasa        1194  0.5  0.5 1305060 85612 ?       Ssl   2025 761:13 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305256 73440 ?       Ssl   2025 553:02 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.7 11834164 115420 ?     Ssl   2025 1247:27 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.6 11816360 103396 ?     Ssl   2025 874:30 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.5 1331116 84572 ?       Ssl   2025 1202:41 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1306200 72584 ?       Ssl   2025 562:17 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298028 66880 ?       Ssl   2025 552:13 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  2.8 12155872 466516 ?     Rsl   2025 6412:07 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  2.9  1.4 11936488 242604 ?     Ssl   2025 4236:04 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      702668  0.3  0.3 1098588 63392 ?       Ssl  03:03   2:20 node /home/sasa/dex8/dex8-worker/starter.js
www-data  759965  0.0  0.0   2608   596 ?        S    15:20   0:00 sh -c ps -aux | grep node
www-data  759967  0.0  0.0   3304   720 ?        S    15:20   0:00 grep node
sasa     1214480  0.3  0.3 1100168 64444 ?       Ssl   2025 176:09 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1100032 64636 ?       Ssl   2025 176:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.3 1100548 64756 ?       Ssl   2025 176:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1100264 65196 ?       Ssl   2025 177:22 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100292 63652 ?       Ssl   2025 176:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.3 1099904 65092 ?       Ssl   2025 176:05 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.4 1102184 66220 ?       Ssl   2025 173:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1102432 65604 ?       Ssl   2025 172:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.5  0.7 11705764 120712 ?     Ssl   2025 292:54 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1099512 63784 ?       Ssl   2025 175:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2628167  0.9  0.7 1178044 130344 ?      Ssl   2025 1187:14 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11826628 102376 ?     Ssl   2025 844:36 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 84580 ?      Ssl   2025 656:05 node /home/sasa/@mikosoft/dodo-examples/server/index.js