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  0.5 1304940 82320 ?       Ssl  Oct24 131:03 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  1.0  0.8 11722424 137564 ?     Ssl  Oct24 238:29 node /home/sasa/dex8/dex8-api/starter.js
sasa        1207  0.4  0.4 1303736 71264 ?       Ssl  Oct24 100:57 node /home/sasa/regoch/regoch-www/server
sasa        1208  0.4  0.4 1304656 72952 ?       Ssl  Oct24  93:23 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  1.0  0.5 11804880 95620 ?      Ssl  Oct24 244:02 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.5 11810316 96516 ?      Ssl  Oct24 138:59 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.4 1329104 81292 ?       Ssl  Oct24 180:31 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1300596 68868 ?       Ssl  Oct24  94:42 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.4  0.3 1297036 65216 ?       Ssl  Oct24  93:29 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.0  2.7 12159820 457556 ?     Ssl  Oct24 684:39 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.4  0.4 1167848 66520 ?       Ssl  Oct24  98:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  2.1  2.9 22686388 478708 ?     Ssl  Oct24 475:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.4  0.3 1100644 64940 ?       Ssl  Oct24  98:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.4  0.3 1100644 64560 ?       Ssl  Oct24  98:11 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.4  0.4 1100644 65612 ?       Ssl  Oct24  97:55 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.4  0.4 1100648 66128 ?       Ssl  Oct24  97:38 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.4  0.3 1100644 64784 ?       Ssl  Oct24  97:45 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.4  0.3 1100640 65472 ?       Ssl  Oct24  97:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.4  0.3 1100128 63828 ?       Ssl  Oct24  95:48 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.4  0.3 1099112 64152 ?       Ssl  Oct24  95:58 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  1.3  0.7 11825968 123592 ?     Ssl  Oct24 295:44 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     2628167  1.0  0.6 1153756 107900 ?      Ssl  Nov04  70:17 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.8  0.5 11807828 96652 ?      Ssl  Nov06  30:39 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.6  0.5 11797384 82300 ?      Ssl  Nov06  23:59 node /home/sasa/@mikosoft/dodo-examples/server/index.js
www-data 3734821  0.0  0.0   2608   596 ?        S    05:45   0:00 sh -c ps -aux | grep node
www-data 3734823  0.0  0.0   3304   712 ?        S    05:45   0:00 grep node