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         914  0.4  0.5 1306708 84100 ?       Rsl  Aug04 237:47 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         935  0.6  0.8 11787352 133184 ?     Ssl  Aug04 356:40 node /home/sasa/dex8/dex8-api/starter.js
sasa         938  0.3  0.4 1306076 74792 ?       Ssl  Aug04 196:40 node /home/sasa/regoch/regoch-www/server
sasa         945  0.3  0.4 1303752 71316 ?       Ssl  Aug04 172:55 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         947  0.6  0.6 11833876 111972 ?     Ssl  Aug04 357:30 node /home/sasa/dex8/dex8-www/server/index.js
sasa         966  0.5  0.6 11809488 99016 ?      Ssl  Aug04 263:45 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         980  0.6  0.5 1330076 83452 ?       Ssl  Aug04 351:05 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         997  0.3  0.4 1301280 69148 ?       Ssl  Aug04 174:30 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1021  0.3  0.3 1297448 65140 ?       Ssl  Aug04 172:06 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1065  0.5  0.6 11815136 99476 ?      Ssl  Aug04 293:47 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1074  0.5  0.6 1149184 104408 ?      Ssl  Aug04 284:12 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1136  0.6  1.0 11865252 167192 ?     Ssl  Aug04 329:44 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1148  0.3  0.4 11794644 78420 ?      Ssl  Aug04 189:58 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1197  0.3  0.3 1099884 64056 ?       Ssl  Aug04 178:06 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1199  0.3  0.4 22277756 78052 ?      Ssl  Aug04 179:43 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1308  0.3  0.3 1100128 63972 ?       Ssl  Aug04 177:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1325  0.3  0.3 1099616 62900 ?       Ssl  Aug04 177:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1393  0.7  0.8 22314752 133728 ?     Ssl  Aug04 376:23 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1395  0.3  0.3 1100140 63572 ?       Ssl  Aug04 178:03 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1489  0.3  0.3 1099872 62988 ?       Ssl  Aug04 178:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1496  0.3  0.3 1100640 64848 ?       Ssl  Aug04 177:15 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1099872 63784 ?       Ssl  Aug04 177:38 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1608  0.3  0.3 1099872 63668 ?       Ssl  Aug04 176:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1686  0.8  0.8 11837928 140476 ?     Ssl  Aug04 424:04 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1371685  0.3  0.5 11801256 87496 ?      Ssl  Aug16 128:18 node /home/sasa/mikosoft-info/solar-wind-energy/server/index.js
sasa     1460918  0.3  0.4 1299880 65900 ?       Ssl  Aug17 124:50 node /home/sasa/sites-nodejs/oxygen-free-copper/server.js
www-data 4058911  0.0  0.0   2608   596 ?        S    08:22   0:00 sh -c ps -aux | grep node
www-data 4058913  0.0  0.0   3304   720 ?        S    08:22   0:00 grep node