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         831  0.5  0.4 1303960 78488 ?       Ssl  Jun15 109:13 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         843  0.5  0.6 11699508 103984 ?     Ssl  Jun15 103:46 node /home/sasa/dex8/dex8-api/starter.js
sasa         858  0.4  0.4 1302344 70832 ?       Ssl  Jun15  81:57 node /home/sasa/regoch/regoch-www/server
sasa         867  0.3  0.4 1298972 66016 ?       Ssl  Jun15  77:31 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         886  0.8  0.6 11822084 108412 ?     Ssl  Jun15 164:49 node /home/sasa/dex8/dex8-www/server/index.js
sasa         888  0.5  0.4 11792244 77296 ?      Ssl  Jun15 112:52 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         904  0.7  0.4 1329652 81792 ?       Ssl  Jun15 150:01 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         910  0.3  0.4 1300240 69624 ?       Ssl  Jun15  78:16 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa         969  0.3  0.3 1297484 64912 ?       Ssl  Jun15  77:19 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa         970  0.6  0.5 11821476 96048 ?      Ssl  Jun15 138:43 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1010  0.6  0.6 1145428 100660 ?      Ssl  Jun15 130:19 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1016  0.8  1.2 11915776 198600 ?     Ssl  Jun15 169:36 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1086  0.4  0.4 11794656 77488 ?      Ssl  Jun15  83:40 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1089  0.3  0.3 1099612 65136 ?       Ssl  Jun15  79:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1159  0.3  0.4 22276156 75844 ?      Ssl  Jun15  80:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1160  0.3  0.3 1099612 63992 ?       Ssl  Jun15  79:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1241  0.3  0.3 1100952 62588 ?       Ssl  Jun15  79:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1242  0.4  0.5 22284124 83168 ?      Ssl  Jun15  84:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1323  0.3  0.3 1099100 63364 ?       Ssl  Jun15  79:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1324  0.3  0.3 1099616 64004 ?       Ssl  Jun15  79:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1398  0.3  0.3 1099104 63804 ?       Ssl  Jun15  79:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1400  0.3  0.3 1099356 64196 ?       Ssl  Jun15  79:38 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1465  0.3  0.3 1099104 63984 ?       Ssl  Jun15  79:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa      178968  0.8  0.5 11810360 96404 ?      Ssl  Jun17 140:23 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      337381  1.3  0.5 1317952 91084 ?       Ssl  Jun19 186:44 node /home/sasa/crypto/dex-arbitrage-bot/scripts/observer/index2
www-data 1031881  0.0  0.0   2608   536 ?        S    04:04   0:00 sh -c ps -aux | grep node
www-data 1031883  0.0  0.0   3304   652 ?        S    04:04   0:00 grep node