..:: 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 1309408 75148 ?       Ssl   2025 1366:39 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11823032 101644 ?     Ssl   2025 2157:42 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304072 70560 ?       Ssl   2025 1383:19 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1301520 69420 ?       Ssl   2025 1363:20 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.2  3.5 12326780 577780 ?     Ssl   2025 17097:02 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  6.7  3.6 12264224 599176 ?     Ssl   2025 27308:50 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa       64840  0.3  0.5 22293448 96712 ?      Ssl  Jul31   8:51 node /home/sasa/dex8/dex8-worker/starter.js
www-data  279599  0.0  0.0   2608   596 ?        S    01:54   0:00 sh -c ps -aux | grep node
www-data  279601  0.0  0.0   3304   716 ?        S    01:54   0:00 grep node
sasa     1214480  0.3  0.7 22311168 125236 ?     Ssl   2025 1144:57 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1101568 64980 ?       Ssl   2025 1042:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1100804 66104 ?       Ssl   2025 1041:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.4 1102568 66912 ?       Ssl   2025 1049:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.4 1102596 66428 ?       Ssl   2025 1044:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1102208 67004 ?       Ssl   2025 1040:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1166440 64660 ?       Ssl   2025 1031:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.4 1102432 66620 ?       Ssl   2025 1027:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.8  0.9 11879524 160000 ?     Rsl   2025 2607:23 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1101816 65788 ?       Ssl   2025 1040:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.7 11824948 120736 ?     Ssl  Apr20 1270:25 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1631573  0.4  0.6 1321648 102088 ?      Ssl  May31 445:18 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa     1904154  0.6  0.9 11862180 151196 ?     Ssl  Apr25 954:37 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.7  0.8 1175772 132256 ?      Ssl   2025 3096:22 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11811064 102740 ?     Ssl   2025 2394:46 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799488 84644 ?      Ssl   2025 1960:45 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1333192 86652 ?       Ssl  Feb21 1624:25 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js