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 1306452 85212 ?       Ssl   2025 1340:10 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1303208 71444 ?       Ssl   2025 965:16 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1236  0.5  0.6 11819604 106932 ?     Ssl   2025 1526:08 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1305176 74248 ?       Ssl   2025 979:11 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1299884 67760 ?       Ssl   2025 963:57 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.5  3.4 12246328 558528 ?     Ssl   2025 12497:54 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  4.2  2.8 12131508 467748 ?     Ssl   2025 11612:20 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.3  0.7 22311168 126272 ?     Ssl   2025 699:09 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1103360 67340 ?       Ssl   2025 616:59 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1100804 66224 ?       Ssl   2025 615:39 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1101032 64600 ?       Ssl   2025 620:03 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100548 64536 ?       Ssl   2025 616:59 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1100672 65896 ?       Ssl   2025 615:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1100648 65492 ?       Ssl   2025 606:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100128 63960 ?       Ssl   2025 604:05 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.6  0.7 11710796 124228 ?     Ssl   2025 1194:50 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1101048 65024 ?       Ssl   2025 614:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1399960  0.8  1.0 11866716 168792 ?     Ssl  Apr20 169:08 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1904154  0.5  0.5 11807184 96644 ?      Ssl  Apr25  71:51 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1176408 132448 ?      Ssl   2025 2192:28 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     2757401  0.3  0.3 1100380 65020 ?       Ssl  04:03   3:15 node /home/sasa/dex8/dex8-worker/starter.js
www-data 2831894  0.0  0.0   2608   588 ?        S    20:42   0:00 sh -c ps -aux | grep node
www-data 2831896  0.0  0.0   3304   720 ?        S    20:42   0:00 grep node
sasa     3168557  0.6  0.5 11802816 91780 ?      Ssl   2025 1592:01 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 84004 ?      Ssl   2025 1317:31 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.7  0.5 1332748 87232 ?       Ssl  Feb21 718:12 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js