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        1273  0.6  0.5 1304788 82464 ?       Ssl  Sep21 272:44 node /home/sasa/.pm2/modules/pm2-logrotate/node_modules/pm2-logr
sasa        1293  1.2  0.8 11722472 134716 ?     Ssl  Sep21 541:28 node /home/sasa/dex8/dex8-api/starter.js
sasa        1298  0.4  0.4 1307544 76328 ?       Ssl  Sep21 214:15 node /home/sasa/regoch/regoch-www/server
sasa        1309  0.4  0.4 1299340 67152 ?       Ssl  Sep21 189:56 node /home/sasa/dex8/dex8-panel/server/index.js
sasa        1320  0.8  0.6 11810096 103672 ?     Ssl  Sep21 398:05 node /home/sasa/dex8/dex8-www/server/index.js
sasa        1329  0.6  0.5 11808484 94800 ?      Ssl  Sep21 283:10 node /home/sasa/mikosoft_hr/www-mikosoft-hr/server/index.js
sasa        1340  0.8  0.5 1199580 82984 ?       Ssl  Sep21 380:52 node /home/sasa/mikosoft-info/api-mikosoft-info/starter.js
sasa        1357  0.4  0.4 1303220 73332 ?       Ssl  Sep21 191:46 node /home/sasa/mikosoft-info/www-mikosoft-info/server/index.js
sasa        1381  0.4  0.4 1297336 65792 ?       Ssl  Sep21 189:00 node /home/sasa/dex8/dex8-kiosk/server/index.js
sasa        1417  0.6  0.5 11821296 96156 ?      Ssl  Sep21 307:41 node /home/sasa/mikosoft-info/dodo-mikosoft-info/server/index.js
sasa        1477  0.4  0.4 11794680 78052 ?      Ssl  Sep21 207:57 node /home/sasa/@mikosoft/dodo-examples/server/index.js
sasa        1966  1.1  0.8 11837088 135716 ?     Ssl  Sep21 502:18 node /home/sasa/mikosoft-info/crypto-mikosoft-info/server/index.
sasa     1026987  0.7  0.6 1154400 110592 ?      Ssl  Oct15  71:23 node /home/sasa/voovuu/voovuu-api/starter.js
sasa     1041499  0.7  0.8 22320204 138868 ?     Ssl  Sep27 277:32 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041553  2.3  0.9 22340548 162260 ?     Ssl  Sep27 815:54 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041586  0.4  0.4 1167976 67220 ?       Ssl  Sep27 152:05 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041612  0.4  0.4 1166944 66092 ?       Ssl  Sep27 152:02 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041650  0.4  0.4 1168736 68480 ?       Ssl  Sep27 152:24 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041678  0.4  0.4 1167204 67440 ?       Ssl  Sep27 152:01 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041713  0.4  0.3 1166436 65064 ?       Ssl  Sep27 151:46 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041745  0.4  0.4 1167204 66344 ?       Ssl  Sep27 152:01 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041773  0.4  0.3 1099364 64408 ?       Ssl  Sep27 147:17 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1041811  0.4  0.3 1099104 63348 ?       Ssl  Sep27 148:22 node /home/sasa/dex8/dex8-worker/starter.js
sasa     1224520  0.0  0.2 726148 40424 ?        Rsl  01:49   0:00 node /usr/local/lib/node_modules/pm2/lib/ProcessContainerFork.js
www-data 1224532  0.0  0.0   2608   596 ?        S    01:49   0:00 sh -c ps -aux | grep node
www-data 1224534  0.0  0.0   3304   716 ?        S    01:49   0:00 grep node
sasa     1617980  1.8  1.3 11978860 222280 ?     Ssl  Oct15 173:09 node /home/sasa/voovuu/voovuu-pub/server/index.js