Test JS script file

Selected file: 053undefined_var.js
Compare console.log() outputs in browser and NodeJS.
Notice: Open browser's console in FireBUG!

  1. 001syntax_unicode.js
  2. 010number_DecToHex.js
  3. 011number_HexToDec.js
  4. 012number_toExponential.js
  5. 013number_modulo.js
  6. 014number_division_by_zero.js
  7. 015number_NaN.js
  8. 016number_infinity.js
  9. 017number_isFinite.js
  10. 018number_isNaN.js
  11. 019number_negative_zero.js
  12. 020number_float_rounding_error.js
  13. 030string_htmlTags.js
  14. 030string_multiline.js
  15. 031string_length.js
  16. 032string_concatenate.js
  17. 032string_concatenate2.js
  18. 033string_minus.js
  19. 035stringmethods_charAt.js
  20. 035stringmethods_concate.js
  21. 035stringmethods_indexOf.js
  22. 035stringmethods_match.js
  23. 035stringmethods_match_memory.js
  24. 035stringmethods_replace.js
  25. 035stringmethods_search.js
  26. 035stringmethods_split.js
  27. 035stringmethods_toString.js
  28. 035stringmethods_toUpperCase.js
  29. 035stringmethods_trim.js
  30. 036string_regexTest.js
  31. 040bool_falsy.js
  32. 040bool_truthy.js
  33. 041bool_comparison.js
  34. 042bool_conditional_operator.js
  35. 043bool_logic_operators.js
  36. 044bool_not_exe_function.js
  37. 050null_typeof.js
  38. 051null_comparison.js
  39. 053undefined_var.js
  40. 054ReferenceError.js
  41. 055global_object_browser.js
  42. 055global_object_node.js
  43. 056global_properties_browser.js
  44. 056global_properties_node.js
  45. 057wrapper_object.js
  46. 058wrapper_object_readonly.js
  47. 60object_reference.js

..:: Source code - 053undefined_var.js ::..

/**
 * undefined cases
 */

//non initialized variable
var x;
console.log(x); //undefined


//function without parameter
function fja(y) { return y; }
console.log(fja());


//non existent property
var obj = {prop1: 'Some string'};
console.log(obj.prop2);
 

..:: NodeJS Console - 053undefined_var.js ::..

$ node 053undefined_var.js 
undefined
undefined
undefined

$ps -aux | grep node (list all node processes)
sasa        1194  0.4  0.5 1306252 85412 ?       Ssl   2025 1339:53 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1303208 71296 ?       Ssl   2025 965:04 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11819604 106456 ?     Ssl   2025 1525:48 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1305176 73504 ?       Ssl   2025 978:58 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1299884 68188 ?       Ssl   2025 963:45 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.5  3.1 12208964 521572 ?     Ssl   2025 12495:41 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  4.2  2.8 12131508 467748 ?     Ssl   2025 11605:46 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 125680 ?     Ssl   2025 698:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1102336 66080 ?       Ssl   2025 616:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1100804 65980 ?       Ssl   2025 615:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1101032 64984 ?       Ssl   2025 619:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100548 64756 ?       Ssl   2025 616:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.3 1100672 65332 ?       Ssl   2025 615:07 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1100648 64608 ?       Ssl   2025 606:05 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100128 63556 ?       Ssl   2025 603:52 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.6  0.7 11710796 126168 ?     Ssl   2025 1194:27 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1100280 64388 ?       Ssl   2025 614:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  0.6 11806300 105732 ?     Ssl  Apr20 168:33 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1904154  0.5  0.6 11826128 100468 ?     Ssl  Apr25  71:26 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1176408 132576 ?      Ssl   2025 2191:59 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     2757401  0.3  0.3 1099612 64336 ?       Ssl  04:03   3:02 node /home/sasa/dex8/dex8-worker/starter.js
www-data 2826686  0.0  0.0   2608   588 ?        S    19:35   0:00 sh -c ps -aux | grep node
www-data 2826688  0.0  0.0   3304   720 ?        S    19:35   0:00 grep node
sasa     3168557  0.6  0.6 11826624 101528 ?     Ssl   2025 1591:34 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 84712 ?      Ssl   2025 1317:10 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332748 86592 ?       Ssl  Feb21 717:42 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js