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 1305252 84888 ?       Ssl   2025 804:23 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1208  0.3  0.4 1304488 73028 ?       Ssl   2025 572:51 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1224  0.8  0.7 11827856 117192 ?     Ssl   2025 1286:01 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1236  0.6  0.6 11818552 105816 ?     Ssl   2025 905:58 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1255  0.8  0.5 1331116 84992 ?       Ssl   2025 1246:32 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1257  0.3  0.4 1305176 73228 ?       Ssl   2025 582:15 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1289  0.3  0.4 1297836 67332 ?       Ssl   2025 571:59 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1363  4.4  3.0 12185868 496236 ?     Ssl   2025 6698:43 node /home/sasa/voovuu/voovuu-pub/server/index.js
sasa        1886  2.9  1.5 11946144 255036 ?     Ssl   2025 4462:37 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1214480  0.4  0.7 22311424 125804 ?     Ssl   2025 259:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214483  0.3  0.4 1102080 66172 ?       Ssl   2025 197:49 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214536  0.3  0.4 1102340 66800 ?       Ssl   2025 197:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214544  0.3  0.3 1101544 65288 ?       Ssl   2025 198:41 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214588  0.3  0.4 1102084 65596 ?       Ssl   2025 197:37 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214617  0.3  0.4 1101952 66740 ?       Ssl   2025 197:13 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214641  0.3  0.3 1099880 63544 ?       Ssl   2025 194:19 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1214671  0.3  0.3 1099360 62424 ?       Ssl   2025 193:34 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1215731  0.8  0.7 11709064 123468 ?     Ssl   2025 502:07 node /home/sasa/dex8/dex8-api/starter.js
sasa     1216489  0.3  0.3 1101304 64988 ?       Ssl   2025 196:26 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1455096  0.3  0.4 1102684 67112 ?       Ssl  03:03   3:54 node /home/sasa/dex8/dex8-worker/starter.js
www-data 1542893  0.0  0.0   2608   596 ?        S    22:33   0:00 sh -c ps -aux | grep node
www-data 1542895  0.0  0.0   3304   648 ?        S    22:33   0:00 grep node
sasa     2628167  0.9  0.8 1176764 134040 ?      Ssl   2025 1235:38 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     3168557  0.6  0.5 11803624 92516 ?      Ssl   2025 878:26 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa     3169051  0.5  0.5 11798920 84832 ?      Ssl   2025 687:55 node /home/sasa/@mikosoft/dodo-examples/server/index.js