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 1303700 82148 ?       Ssl  Oct24 430:40 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1200  1.0  0.8 11724544 140724 ?     Ssl  Oct24 773:22 node /home/sasa/dex8/dex8-api/starter.js
sasa        1208  0.4  0.4 1305000 73372 ?       Ssl  Oct24 310:23 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  1.0  0.7 11836064 117640 ?     Ssl  Oct24 741:34 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.6 11813900 99548 ?      Ssl  Oct24 488:00 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.9  0.5 1330860 83792 ?       Ssl  Oct24 657:30 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.4  0.4 1301672 70860 ?       Ssl  Oct24 315:37 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.4  0.4 1297580 66692 ?       Ssl  Oct24 310:21 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  3.5  2.7 12156284 450940 ?     Ssl  Oct24 2568:45 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1449  0.4  0.3 1232104 64456 ?       Ssl  Oct24 326:12 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1528  2.0  2.7 33120988 450248 ?     Ssl  Oct24 1454:39 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1529  0.4  0.4 1102692 66456 ?       Ssl  Oct24 325:18 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1606  0.4  0.4 1102948 67140 ?       Ssl  Oct24 326:30 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1607  0.4  0.4 1103204 66688 ?       Ssl  Oct24 325:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1705  0.4  0.4 1102184 66324 ?       Ssl  Oct24 325:10 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1706  0.4  0.3 1101412 64864 ?       Ssl  Oct24 324:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1805  0.4  0.4 1167968 66408 ?       Ssl  Oct24 325:35 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1807  0.4  0.3 1100640 64220 ?       Ssl  Oct24 318:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1885  0.4  0.4 1102440 65840 ?       Ssl  Oct24 319:34 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1886  2.3  1.0 11861932 165488 ?     Ssl  Oct24 1715:12 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     2628167  1.0  0.7 1174188 130132 ?      Ssl  Nov04 568:39 node /home/sasa/voovuu/voovuu-api/starter.js
www-data 3120651  0.0  0.0   2608   528 ?        S    16:34   0:00 sh -c ps -aux | grep node
www-data 3120653  0.0  0.0   3304   720 ?        S    16:34   0:00 grep node
sasa     3168557  0.7  0.5 11802104 91104 ?      Ssl  Nov06 422:30 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798664 83888 ?      Ssl  Nov06 283:59 node /home/sasa/@mikosoft/dodo-examples/server/index.js