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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.