..:: 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 1304528 85476 ?       Ssl   2025 749:57 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305256 73288 ?       Ssl   2025 544:41 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.7 11836560 116532 ?     Ssl   2025 1230:32 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.6 11818920 102636 ?     Ssl   2025 861:18 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.5 1331116 85228 ?       Ssl   2025 1184:33 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1304152 73336 ?       Ssl   2025 553:51 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297836 67888 ?       Ssl   2025 543:55 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  2.6 12138108 441704 ?     Ssl   2025 6282:08 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  2.9  1.4 11936744 243084 ?     Ssl   2025 4148:37 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      492181  0.3  0.3 1099100 63808 ?       Ssl  03:02   2:58 node /home/sasa/dex8/dex8-worker/starter.js
www-data  556053  0.0  0.0   2608   528 ?        S    17:59   0:00 sh -c ps -aux | grep node
www-data  556055  0.0  0.0   3304   712 ?        S    17:59   0:00 grep node
sasa     1214480  0.3  0.3 1099656 63372 ?       Ssl   2025 167:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1100032 64196 ?       Ssl   2025 167:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.3 1100036 64860 ?       Ssl   2025 167:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1100264 64680 ?       Ssl   2025 168:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1099268 63064 ?       Ssl   2025 167:34 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.3 1099904 64772 ?       Ssl   2025 167:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1099880 63540 ?       Ssl   2025 164:38 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1099360 62644 ?       Ssl   2025 164:07 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.5  0.7 11704608 118764 ?     Ssl   2025 278:01 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1099768 63716 ?       Ssl   2025 166:23 node /home/sasa/dex8/dex8-worker/starter.js
sasa     2628167  0.9  0.8 1176508 132152 ?      Ssl   2025 1166:39 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.6 11828968 114100 ?     Ssl   2025 830:05 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 84436 ?      Ssl   2025 642:39 node /home/sasa/@mikosoft/dodo-examples/server/index.js