little endian

[CTG]

var x = "B113769A"

How do you convert B113769A to "9A7613B1" to get the proper
conversion ?

 

[RobG]

var x = "B113769A"

How do you convert B113769A to "9A7613B1" to get the proper
conversion ?

I guess you want to just reverse the order of the pairs, I'm sure
there are many algorithms - here's one:


function swapEndianHex(x)
{
// Make sure it's a string
x = String(x);

// Return if has invalid characters
if (/[^a-f0-9]/.test(x.toLowerCase())) return;

// Might need left padding
x = (x.length % 2)? '0'+x : x;

// Split into an array of pairs, reverse and join again
return x.match(/../g).reverse().join('');
}


Depending on your requirements, you might be able to remove some or
all of the first 3 statements that do validation.

 

[Evertjan.]

RobG wrote on 22 mei 2008 in comp.lang.javascript:

// Return if has invalid characters
if (/[^a-f0-9]/.test(x.toLowerCase())) return;

if ( /[^a-f0-9]/i.test(x) ) return;

// Might need left padding
x = (x.length % 2)? '0'+x : x;

// Split into an array of pairs, reverse and join again
return x.match(/../g).reverse().join('');

Nice! Will remember that one.

 

[RobG]

RobG wrote on 22 mei 2008 in comp.lang.javascript:

var x = "B113769A"

  // Return if has invalid characters
  if (/[^a-f0-9]/.test(x.toLowerCase())) return;

if ( /[^a-f0-9]/i.test(x) ) return;

Ah yes...

Nice! Will remember that one.

Credit where credit's due - the inspiration came from the second
banana example here:

<URL: http://www.merlyn.demon.co.uk/js-valid.htm#JS >