Test JS script file

Selected file: 23var_null_obj.js
Compare console.log() outputs in browser and NodeJS.
Notice: Open browser's console in FireBUG!

  1. 01var_identifier.js
  2. 03var_data_types.js
  3. 03var_data_types_novar.js
  4. 04var_primitiveToObject.js
  5. 05var_string_object.js
  6. 06var_converting_data_types.js
  7. 10var_local_global_outside_function.js
  8. 12var_local_global_inside_function.js
  9. 13var_local_global_inside_function2.js
  10. 14var_local_global_return.js
  11. 16var_global_browser.js
  12. 16var_global_node.js
  13. 20var_Infinity.js
  14. 21var_NaN.js
  15. 22var_undefined.js
  16. 22var_undefined2.js
  17. 23var_empty_string.js
  18. 23var_null_obj.js

..:: Source code - 23var_null_obj.js ::..

/**
 * defininig null object
 */

x = 23;
x = null; //redefine variable x to null object
var type=typeof x;

console.log(type +': '+ x); //object: null


if(x==null) console.log('x is null'); //works
else if(x=='') console.log('x is empty string'); //dont work
 

..:: NodeJS Console - 23var_null_obj.js ::..

$ node 23var_null_obj.js 
object: null
x is null

$ps -aux | grep node (list all node processes)
sasa        1194  0.4  0.4 1301744 77808 ?       Ssl  Oct24   8:57 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.5  0.6 11705060 111920 ?     Ssl  Oct24  10:59 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.3  0.3 1297676 64376 ?       Ssl  Oct24   6:36 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.2  0.3 1295416 61688 ?       Ssl  Oct24   6:20 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.6  1.1 11937108 196112 ?     Ssl  Oct24  14:43 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.3  0.4 11797592 81016 ?      Ssl  Oct24   6:59 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.5  0.4 1328700 81108 ?       Ssl  Oct24  11:45 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.2  0.3 1296520 63608 ?       Ssl  Oct24   6:27 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.2  0.3 1293992 60368 ?       Ssl  Oct24   6:17 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1292  0.3  0.5 11818452 90392 ?      Ssl  Oct24   8:06 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1361  0.5  0.6 1147680 102768 ?      Ssl  Oct24  12:31 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1363  1.5  0.9 11857968 156700 ?     Ssl  Oct24  34:15 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1441  0.3  0.4 11660104 74692 ?      Ssl  Oct24   6:50 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1449  0.3  0.3 1099364 63804 ?       Ssl  Oct24   6:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  0.4  0.7 22311980 122892 ?     Ssl  Oct24  10:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.3  0.3 1099364 63996 ?       Ssl  Oct24   6:30 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.3  0.3 1099364 63804 ?       Ssl  Oct24   6:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1099364 63876 ?       Ssl  Oct24   6:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.3  0.3 1099368 64096 ?       Ssl  Oct24   6:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.3  0.3 1099364 64392 ?       Ssl  Oct24   6:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.3  0.3 1099360 64952 ?       Ssl  Oct24   6:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.3  0.3 1099872 63492 ?       Ssl  Oct24   6:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.3  0.3 1099368 64264 ?       Ssl  Oct24   6:34 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  0.5  0.6 11811496 108980 ?     Ssl  Oct24  12:44 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data  170686  0.0  0.0   2608   596 ?        S    02:21   0:00 sh -c ps -aux | grep node
www-data  170688  0.0  0.0   3304   716 ?        S    02:21   0:00 grep node