Javascript check if character is a vowel -

i've looked @ plenty of questions related mine here they're using different methods method have use. i'm aware it's long winded way find out when there simpler ways i'm following instructions.

why doesn't below code work? function checks if it's vowel. input checked see if it's length 1. if it's 1, call function. if it's greater 1, ask input until length 1.

i see boolean doesn't exist in js. guess question invalid now!

function isvowel(x){      boolean result;          if(x == "a" || x == "e" || x == "i" || x == "o" || x == "u" ) {             result = true;         }         else{             result = false;         }     return result;     }      var input;       input = prompt("enter character ");     input = input.touppercase();     if(input.length == 1){         isvowel(input);         }     }     else{         while(input.length != 1){             prompt("enter character ");             if(input.length == 1){                 isvowel(input);             }         }     }      alert(isvowel(input)); 

you're calling isvowel in 3 places, , throwing away return value in first two. if want see return value in first 2 places, show (via alert in last example, or of several other ways).

there other issues well:

• as devqon points out, you've used boolean rather var, code won't parse

• any time find writing:

  var result; if (condition) {     result = true; } else {     result = false; } return result; 

  ...stop , make it:

  var result = condition; return result; 

  so isvowel:

  function isvowel(x) {      var result;      result = x == "a" || x == "e" || x == "i" || x == "o" || x == "u";     return result; } 

  (you can, of course, make one-liner, it's easier debug way.)

• you have } after if block (reasonable, consistent formatting have make obvious)

• your while loop never end, because never update input return value of prompt

• rather if followed while, use do-while

here's updated version changes

function isvowel(x) {      var result;      result = x == "a" || x == "e" || x == "i" || x == "o" || x == "u";    return result;  }    var input;    {    input = prompt("enter character ");    if (input.length == 1) {      alert(isvowel(input));    }  } while (input.length != 1);