..:: 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        1208  0.3  0.4 1305000 72188 ?       Ssl   2025 1162:54 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11821520 105072 ?     Ssl   2025 1837:01 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1307724 73416 ?       Ssl   2025 1179:04 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1298028 67236 ?       Ssl   2025 1161:12 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.3  3.1 12219348 523692 ?     Ssl   2025 14758:44 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  5.6  3.5 12235880 574612 ?     Ssl   2025 19188:47 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 125328 ?     Ssl   2025 919:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101056 65156 ?       Ssl   2025 827:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101316 66136 ?       Ssl   2025 825:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1101288 66380 ?       Ssl   2025 832:01 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.4 1103364 67580 ?       Ssl   2025 827:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1101696 66260 ?       Ssl   2025 825:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166184 64184 ?       Ssl   2025 815:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1101152 65572 ?       Ssl   2025 812:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11843932 123668 ?     Ssl   2025 1718:54 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1101560 65372 ?       Ssl   2025 824:49 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.7 11810336 114992 ?     Ssl  Apr20 689:21 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1631573  0.4  0.4 1302692 77700 ?       Ssl  May31 104:41 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1904154  0.6  0.9 11869668 150928 ?     Ssl  Apr25 466:38 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1191388 132224 ?      Ssl   2025 2632:59 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11815224 103080 ?     Ssl   2025 1961:33 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 84448 ?      Ssl   2025 1633:36 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1333192 86776 ?       Ssl  Feb21 1173:25 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa     3389722  0.3  0.5 22292136 96860 ?      Ssl  Jun15   9:16 node /home/sasa/dex8/dex8-worker/starter.js
www-data 3598873  0.0  0.0   2608   596 ?        S    02:38   0:00 sh -c ps -aux | grep node
www-data 3598875  0.0  0.0   3304   716 ?        S    02:38   0:00 grep node