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         831  0.4  0.4 1300928 72144 ?       Ssl  Jun15   7:33 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa         843  0.4  0.6 11696264 100648 ?     Ssl  Jun15   6:55 node /home/sasa/dex8/dex8-api/starter.js
sasa         858  0.3  0.3 1032208 61020 ?       Ssl  Jun15   5:30 node /home/sasa/regoch/regoch-www/server
sasa         867  0.3  0.3 1292724 58884 ?       Ssl  Jun15   5:23 node /home/sasa/dex8/dex8-panel/server/index.js
sasa         886  0.7  0.5 11810200 91804 ?      Ssl  Jun15  12:10 node /home/sasa/dex8/dex8-www/server/index.js
sasa         888  0.3  0.4 11789848 74524 ?      Ssl  Jun15   5:49 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa         904  0.6  0.4 1329612 81288 ?       Ssl  Jun15   9:51 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa         910  0.3  0.3 1295860 63920 ?       Ssl  Jun15   5:24 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa         969  0.3  0.3 1028148 55656 ?       Ssl  Jun15   5:19 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa         970  0.4  0.5 11814192 94712 ?      Ssl  Jun15   7:27 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1010  0.4  0.5 1138968 92236 ?       Ssl  Jun15   6:54 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1016  0.6  0.6 11808920 105204 ?     Ssl  Jun15   9:40 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1086  0.3  0.4 11595744 74892 ?      Ssl  Jun15   5:43 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1089  0.3  0.3 1099356 64876 ?       Ssl  Jun15   5:34 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1159  0.3  0.3 1099360 65124 ?       Ssl  Jun15   5:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1160  0.3  0.3 1099356 63984 ?       Ssl  Jun15   5:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1241  0.3  0.3 1100696 62824 ?       Ssl  Jun15   5:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1242  0.3  0.4 22277820 75928 ?      Ssl  Jun15   5:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1323  0.3  0.3 1099356 64040 ?       Ssl  Jun15   5:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1324  0.3  0.3 1099360 63988 ?       Ssl  Jun15   5:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1398  0.3  0.3 1099360 64592 ?       Ssl  Jun15   5:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1400  0.3  0.3 1099356 63820 ?       Ssl  Jun15   5:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1465  0.3  0.3 1099360 63904 ?       Ssl  Jun15   5:30 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1475  0.3  0.6 11809572 105456 ?     Ssl  Jun15   6:08 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
www-data   77209  0.0  0.0   2608   532 ?        S    05:05   0:00 sh -c ps -aux | grep node
www-data   77211  0.0  0.0   3304   728 ?        S    05:05   0:00 grep node