..:: Source code - 01callback.js ::..

/**
 * basic usage of callbacks
 */

/* MAIN FUNCTION */
function addnum(x, cb) {
  console.log('x=' + x);
  cb(x);
}


/* CALLBACKS */

//callback which adds 5
function cb5(a) {
  var rez = a + 5;
  console.log('a+5=' + rez);
}

//callback which adds 100
function cb100(a) {
  var rez = a + 100;
  console.log('a+100=' + rez);
}

//execute main function with callback cb5
addnum(2, cb5);

console.log();

//execute main function with callback cb100
addnum(2, cb100);


/* $node 01callback
x=2
a+5=7

x=2
a+100=102
 */

..:: NodeJS Console - 01callback.js ::..

x=2
a+5=7

x=2
a+100=102

$ps -aux | grep node (list all node processes)
sasa        1194  0.5  0.5 1305548 84968 ?       Ssl   2025 1047:18 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305000 73100 ?       Ssl   2025 751:37 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.7 11834488 116008 ?     Ssl   2025 1663:09 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11818808 106508 ?     Ssl   2025 1189:02 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304920 73080 ?       Ssl   2025 763:00 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1301872 71652 ?       Ssl   2025 750:16 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  2.7 12148192 457500 ?     Ssl   2025 9300:16 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.2  1.9 12003164 326816 ?     Ssl   2025 6734:39 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.4  0.7 22311424 126396 ?     Ssl   2025 459:21 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1100800 65088 ?       Ssl   2025 388:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101060 65724 ?       Ssl   2025 387:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1101032 64600 ?       Ssl   2025 390:14 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100548 64108 ?       Ssl   2025 388:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100928 65876 ?       Ssl   2025 387:28 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1100392 63524 ?       Ssl   2025 381:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1102944 66360 ?       Ssl   2025 380:21 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11708808 124264 ?     Ssl   2025 817:45 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1100792 64772 ?       Ssl   2025 386:59 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1740742  0.3  0.3 1097056 61372 ?       Ssl  03:03   0:24 node /home/sasa/dex8/dex8-worker/starter.js
www-data 1749799  0.0  0.0   2608   528 ?        S    05:07   0:00 sh -c ps -aux | grep node
www-data 1749801  0.0  0.0   3304   648 ?        S    05:07   0:00 grep node
sasa     2509059  0.5  0.6 11825824 102952 ?     Ssl  Feb14 262:57 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1177176 132912 ?      Ssl   2025 1670:45 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11825004 100524 ?     Ssl   2025 1194:27 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 84820 ?      Ssl   2025 975:20 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1330104 82656 ?       Ssl  Feb21 214:52 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js