Test JS script file

Selected file: 040bool_falsy.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 - 040bool_falsy.js ::..

/**
 * Falsy values: undefined, null, NaN, 0, -0, ""
 */


// The following returns false
console.log(Boolean(undefined));
console.log(Boolean(null));
console.log(Boolean(NaN));
console.log(Boolean(0));
console.log(Boolean(-0));
console.log(Boolean("")); //empty string returns false too
console.log(Boolean('')); //empty string (single quotes)

console.log(Boolean());
 

..:: NodeJS Console - 040bool_falsy.js ::..

$ node 040bool_falsy.js 
false
false
false
false
false
false
false
false

$ps -aux | grep node (list all node processes)
sasa         890  0.5  0.5 11797276 84148 ?      Ssl   2024 1531:06 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         903  0.7  0.5 1331320 84068 ?       Ssl   2024 2170:32 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         929  0.3  0.4 1302328 71296 ?       Ssl   2024 1024:11 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa         943  0.3  0.4 1303368 70032 ?       Ssl   2024 1002:31 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa         980  0.5  0.5 11822440 97560 ?      Ssl   2024 1647:04 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa         981  0.5  0.6 1153712 109616 ?      Ssl   2024 1701:34 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1039  0.8  1.8 12072744 300684 ?     Ssl   2024 2506:21 node /home/sasa/voovuu/voovuu-pub/server/index.js
www-data 1225420  0.0  0.0   2608   600 ?        S    15:53   0:00 sh -c node 01const.js
www-data 1225424  0.0  0.1 196312 21012 ?        Dl   15:53   0:00 node 01const.js
www-data 1225432  0.0  0.0   2608   540 ?        S    15:53   0:00 sh -c ps -aux | grep node
www-data 1225434  0.0  0.0   3304   660 ?        S    15:53   0:00 grep node
sasa     1788108  0.4  0.5 11806900 87868 ?      Ssl  Mar16 233:33 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1790865  0.7  0.6 11820128 106844 ?     Ssl  Jan30 867:11 node /home/sasa/dex8/dex8-www/server/index.js
sasa     1791369  0.7  0.8 11789608 139744 ?     Ssl  Jan30 868:56 node /home/sasa/dex8/dex8-api/starter.js
sasa     2044488  0.3  0.4 1300372 70280 ?       Ssl   2024 870:58 node /home/sasa/dex8/dex8-panel/server/index.js
sasa     2574087  0.3  0.4 11795224 79412 ?      Ssl   2024 955:13 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa     3598766  0.3  0.4 1100892 66400 ?       Ssl   2024 588:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598767  0.3  0.4 22280560 81144 ?      Ssl   2024 598:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598774  0.3  0.4 1101408 66848 ?       Ssl   2024 590:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598775  0.3  0.4 1101152 67060 ?       Ssl   2024 592:03 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598802  0.6  1.0 22350028 179060 ?     Ssl   2024 1082:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598803  0.3  0.3 1100896 65532 ?       Ssl   2024 588:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598851  0.3  0.4 1102180 67724 ?       Ssl   2024 589:00 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598853  0.3  0.4 1101412 67092 ?       Ssl   2024 588:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598925  0.3  0.5 1329408 82068 ?       Ssl   2024 613:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa     3598927  0.3  0.4 1296908 66116 ?       Ssl   2024 589:38 node /home/sasa/dex8/dex8-worker/starter.js