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        1197  1.3  0.6 1326332 98756 ?       Ssl  Oct18 308:01 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1211  8.6  0.7 11710212 115180 ?     Ssl  Oct18 1922:21 node /home/sasa/dex8/dex8-api/starter.js
sasa        1218  0.4  0.5 11801072 84320 ?      Ssl  Oct18  98:25 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1219  0.7  0.6 11826508 103084 ?     Ssl  Oct18 171:25 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1232  0.4  0.5 11806908 89688 ?      Ssl  Oct18 101:09 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1248  0.6  0.5 1339320 85176 ?       Ssl  Oct18 142:57 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1274  0.3  0.4 1300692 67644 ?       Ssl  Oct18  69:35 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1277  0.3  0.3 1298272 64312 ?       Ssl  Oct18  68:24 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1335  0.4  0.8 11855840 132720 ?     Ssl  Oct18 100:16 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1337  0.6  0.7 1163528 116148 ?      Ssl  Oct18 152:05 node /home/sasa/voovuu/voovuu-api/starter.js
sasa        1385  3.7  3.8 12351272 622552 ?     Ssl  Oct18 823:57 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1387  0.3  0.4 11797452 80520 ?      Ssl  Oct18  74:49 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1457  0.3  0.3 1100128 62640 ?       Ssl  Oct18  69:50 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1458  0.3  0.4 22278316 77740 ?      Ssl  Oct18  70:53 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1514  0.3  0.3 1100516 63820 ?       Ssl  Oct18  69:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1515  0.3  0.3 1100388 64380 ?       Ssl  Oct18  69:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1593  0.3  0.3 1100128 64304 ?       Ssl  Oct18  69:47 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1595  0.3  0.3 1100384 64164 ?       Ssl  Oct18  69:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1660  0.3  0.3 1100528 64628 ?       Ssl  Oct18  69:25 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1661  0.3  0.3 1100128 64544 ?       Ssl  Oct18  69:31 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1732  0.3  0.3 1100128 64324 ?       Ssl  Oct18  69:33 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1734  0.3  0.3 1100128 64100 ?       Ssl  Oct18  69:20 node /home/sasa/dex8/dex8-worker/starter.js
sasa        1792  0.4  0.5 11800792 88220 ?      Ssl  Oct18 106:52 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa      367378  0.6  0.5 1331052 84184 ?       Ssl  Oct21 111:59 node /home/sasa/miko/miko-hr/api/starter.js
sasa      367471  1.2  1.0 11896848 165968 ?     Ssl  Oct21 217:07 node /home/sasa/miko/miko-hr/server/index.js
www-data 1706286  0.0  0.0   2608   528 ?        S    23:27   0:00 sh -c ps -aux | grep node
www-data 1706288  0.0  0.0   3304   720 ?        S    23:27   0:00 grep node