This is a function normally found in the C language. However it is useful to script developers as well and may be available in some implementations as an extension to the ECMA standard functionality.

This function tests to see if a character is printable. However it does exclude the space character from the set of valid characters that return true. It is likely that implementation provided versions of this will only support the lower 255 characters in the Unicode character set. Some may only support the lower 128 that correspond to the ASCII character set.

Strictly speaking, this function should be coded to be aware of locale specific issues. You may want to take the example simulation provided here and modify it to your own needs to support that. This is just a basic working example.

Example code:

   // Test for visibly printable characters

   // (only good up to char 127)

   function isGraph(aChar)

   {

       myCharCode = aChar.charCodeAt(0);

   

      if((myCharCode > 32) && (myCharCode <  127))

      {

         return true;

      }

   

      return false;

   }