..:: 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  0.4  0.5 1306852 85572 ?       Ssl   2025 1332:30 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1303464 71944 ?       Ssl   2025 959:49 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11818836 107548 ?     Ssl   2025 1517:34 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304920 73224 ?       Ssl   2025 973:41 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297836 68400 ?       Ssl   2025 958:29 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.5  2.7 12159100 455452 ?     Ssl   2025 12434:12 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  4.1  2.8 12130740 462756 ?     Ssl   2025 11452:15 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 125488 ?     Ssl   2025 693:04 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1101312 65600 ?       Ssl   2025 611:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.3 1100804 65460 ?       Ssl   2025 609:51 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1101032 65032 ?       Ssl   2025 614:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1101316 65168 ?       Ssl   2025 611:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100672 65840 ?       Ssl   2025 609:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.4 1101672 65524 ?       Ssl   2025 600:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100128 64164 ?       Ssl   2025 598:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.6  0.7 11710144 124380 ?     Ssl   2025 1185:02 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1101816 66112 ?       Ssl   2025 608:59 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.9  0.6 11826012 112688 ?     Ssl  Apr20 155:29 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1904154  0.5  0.6 11834064 109252 ?     Ssl  Apr25  61:57 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1176408 131144 ?      Ssl   2025 2180:08 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     2646998  0.3  0.3 1100188 62808 ?       Ssl  04:03   2:17 node /home/sasa/dex8/dex8-worker/starter.js
www-data 2700923  0.0  0.0   2608   588 ?        S    15:38   0:00 sh -c ps -aux | grep node
www-data 2700925  0.0  0.0   3304   716 ?        S    15:38   0:00 grep node
sasa     3168557  0.6  0.5 11821760 96568 ?      Ssl   2025 1581:23 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 84556 ?      Ssl   2025 1308:47 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332748 86288 ?       Ssl  Feb21 705:27 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js