..:: Source code - 01var_identifier.js ::..

/**
 * Variable identifier
 *  - can use any letter, digit, underscore (_) or dollar sign ($)
 *  - must start with _ , $ or letter
 *  - can't start with number
 */

//Good identifiers
var _name = 'John';
var firstName = 'Mary';
var $name = "Dollar";
var secondName2 = 'Smith';


//Bad identifiers
//var 5name = 'John'; //SyntaxError: identifier starts immediately after numeric literal

..:: NodeJS Console - 01var_identifier.js ::..

$ps -aux | grep node (list all node processes)
sasa         914  0.4  0.5 1306664 83892 ?       Ssl  Aug04 230:45 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         935  0.6  0.8 11787352 133104 ?     Ssl  Aug04 345:57 node /home/sasa/dex8/dex8-api/starter.js
sasa         938  0.3  0.4 1305564 74020 ?       Ssl  Aug04 190:23 node /home/sasa/regoch/regoch-www/server
sasa         945  0.3  0.4 1303752 71368 ?       Ssl  Aug04 167:50 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         947  0.6  0.6 11818516 105748 ?     Ssl  Aug04 347:36 node /home/sasa/dex8/dex8-www/server/index.js
sasa         966  0.5  0.6 11811536 99272 ?      Ssl  Aug04 255:52 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         980  0.6  0.5 1330076 83180 ?       Ssl  Aug04 339:42 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         997  0.3  0.4 1300940 68868 ?       Ssl  Aug04 169:22 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1021  0.3  0.3 1297192 65504 ?       Ssl  Aug04 167:02 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1065  0.5  0.5 11815648 98156 ?      Ssl  Aug04 284:25 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1074  0.5  0.6 1149184 104220 ?      Ssl  Aug04 275:45 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1136  0.6  1.0 11865252 168776 ?     Ssl  Aug04 319:24 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1148  0.3  0.4 11794644 77924 ?      Ssl  Aug04 184:17 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1197  0.3  0.3 1100140 63404 ?       Ssl  Aug04 172:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1199  0.3  0.4 22278268 78508 ?      Ssl  Aug04 174:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1308  0.3  0.3 1099872 64260 ?       Ssl  Aug04 172:18 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1325  0.3  0.3 1099616 63024 ?       Ssl  Aug04 172:21 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1393  0.7  0.8 22335444 139716 ?     Ssl  Aug04 364:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1395  0.3  0.3 1100140 63084 ?       Ssl  Aug04 172:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1489  0.3  0.3 1100128 63516 ?       Ssl  Aug04 172:52 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1496  0.3  0.3 1100384 64724 ?       Ssl  Aug04 172:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1100128 63776 ?       Ssl  Aug04 172:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1608  0.3  0.3 1099616 63444 ?       Ssl  Aug04 171:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1686  0.7  0.8 11839116 141100 ?     Ssl  Aug04 399:17 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1371685  0.3  0.5 11801512 87216 ?      Ssl  Aug16 122:44 node /home/sasa/mikosoft-info/solar-wind-energy/server/index.js
sasa     1460918  0.3  0.3 1299880 65504 ?       Ssl  Aug17 119:07 node /home/sasa/sites-nodejs/oxygen-free-copper/server.js
www-data 3956904  0.0  0.0   2608   588 ?        S    12:42   0:00 sh -c ps -aux | grep node
www-data 3956906  0.0  0.0   3304   712 ?        S    12:42   0:00 grep node