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  0.5  0.5 1304444 82240 ?       Ssl   2025 1061:33 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1305000 73488 ?       Ssl   2025 762:05 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.7 11836536 118536 ?     Ssl   2025 1682:51 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.6 11823672 107024 ?     Ssl   2025 1205:34 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1257  0.3  0.4 1304920 74496 ?       Ssl   2025 773:36 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1301872 71408 ?       Ssl   2025 760:40 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  2.9 12181572 491056 ?     Ssl   2025 9403:09 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  3.2  2.0 12008632 330336 ?     Ssl   2025 6887:46 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.4  0.7 22311424 126448 ?     Ssl   2025 471:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.3 1100800 65020 ?       Ssl   2025 399:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1101316 66180 ?       Ssl   2025 398:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1100776 64800 ?       Ssl   2025 401:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.3 1100804 64968 ?       Ssl   2025 399:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1101696 66348 ?       Ssl   2025 398:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1100136 64148 ?       Ssl   2025 392:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1100128 63424 ?       Ssl   2025 391:16 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.7  0.7 11708808 124776 ?     Ssl   2025 836:01 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.4 1102328 66204 ?       Ssl   2025 398:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1953746  0.3  0.3 1098588 63612 ?       Ssl  03:03   1:58 node /home/sasa/dex8/dex8-worker/starter.js
www-data 1998555  0.0  0.0   2608   536 ?        S    13:04   0:00 sh -c ps -aux | grep node
www-data 1998557  0.0  0.0   3304   648 ?        S    13:04   0:00 grep node
sasa     2509059  0.5  0.5 11802336 92636 ?      Ssl  Feb14 281:22 node /home/sasa/miko/miko-hr/server/index.js
sasa     2628167  0.8  0.8 1179736 133324 ?      Ssl   2025 1693:49 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11800976 90776 ?      Ssl   2025 1212:55 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11799176 84728 ?      Ssl   2025 992:02 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3264954  0.6  0.5 1330104 82608 ?       Ssl  Feb21 237:10 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js