Re: Xor characters in string do not work

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From	Ben Bacarisse <ben.usenet@bsb.me.uk>
Newsgroups	comp.lang.javascript
Subject	Re: Xor characters in string do not work
Date	Wed, 11 Mar 2015 13:09:13 +0000
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jonas.thornvall@gmail.com writes:

XOR does work but...

> <SCRIPT LANGUAGE="Javascript">
> key="nyckel";
> cryptstr="text"
> j=1;
> i=1;

You'd be better off using var to declare these variables inside the
function "test" (though obviously you'll want to use parameters eventually).

> function test(){ document.write(key.charCodeAt[j]);

charCodeAt is a function -- use key.charCodeAt(j).

> document.write(cryptstr.charCodeAt[j]);

Ditto.

> cryptstr.charCodeAt[i]^= key.charCodeAt[j]^cryptstr.charCodeAt[i];

You can't assign to the result of charCodeAt.  You can't even modify a
string using the special cryptstr[i] syntax.  You need to build a new
string from the old one.

Finally, two ^ operations (as are hinted at here) are a no-op.  I.e. an
XOR operation with some value is its own inverse.

> document.write(cryptstr[i]);
> }
> test();
> </script>

-- 
Ben.

Thread

Xor characters in string do not work jonas.thornvall@gmail.com - 2015-03-11 04:44 -0700
  Re: Xor characters in string do not work Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-03-11 13:09 +0000
    Re: Xor characters in string do not work jonas.thornvall@gmail.com - 2015-03-11 06:49 -0700
      Re: Xor characters in string do not work Martin Honnen <mahotrash@yahoo.de> - 2015-03-11 15:34 +0100
        Re: Xor characters in string do not work Thomas 'PointedEars' Lahn <PointedEars@web.de> - 2015-03-12 15:43 +0100
      Re: Xor characters in string do not work Scott Sauyet <scott.sauyet@gmail.com> - 2015-03-11 07:52 -0700

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