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        1194  0.5  0.4 1304276 81740 ?       Ssl  Oct24 250:30 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  0.9  0.8 11723120 140076 ?     Ssl  Oct24 444:16 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1306172 74668 ?       Ssl  Oct24 203:51 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.3  0.4 1304912 72448 ?       Ssl  Oct24 179:09 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.9  0.5 11802404 94496 ?      Ssl  Oct24 436:00 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.5  0.5 11809548 96704 ?      Ssl  Oct24 273:55 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.7  0.5 1330472 84388 ?       Ssl  Oct24 363:40 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1300548 69768 ?       Ssl  Oct24 182:06 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297912 66988 ?       Ssl  Oct24 179:37 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.1  2.6 12137684 440732 ?     Ssl  Oct24 1488:52 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.3  0.3 1166312 64004 ?       Ssl  Oct24 188:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  1.8  2.5 22628672 424644 ?     Ssl  Oct24 863:08 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.3  0.3 1099620 63988 ?       Ssl  Oct24 188:07 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.3  0.3 1099364 62880 ?       Ssl  Oct24 188:09 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.3  0.3 1099876 64300 ?       Ssl  Oct24 187:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.3  0.3 1100392 64696 ?       Ssl  Oct24 187:27 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.3  0.3 1100132 63856 ?       Ssl  Oct24 187:29 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.3  0.3 1100640 64476 ?       Ssl  Oct24 187:36 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.3  0.4 1102944 66500 ?       Ssl  Oct24 183:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.3  0.4 1102184 65912 ?       Ssl  Oct24 185:07 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.6  0.9 11855604 157004 ?     Ssl  Oct24 760:35 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     2628167  0.8  0.7 1167788 123772 ?      Ssl  Nov04 264:02 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11823052 98212 ?      Ssl  Nov06 184:49 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.4  0.5 11798408 83132 ?      Ssl  Nov06 121:24 node /home/sasa/@mikosoft/dodo-examples/server/index.js
www-data 3207606  0.0  0.0   2608   532 ?        S    07:40   0:00 sh -c ps -aux | grep node
www-data 3207608  0.0  0.0   3304   724 ?        S    07:40   0:00 grep node