Iterating through bytes by 2 starting from 0

Question

How do you iterate through an array of bytes like:

var data = new Buffer("0A0B0C0D", "hex");

for (var i = 0; i < data.length; i++) {
  console.log( data[i] ); // will iterate 1 by 1. Not what I wanted
  console.log( data[i+=1] ); // tried
  console.log( data[(i+=1)-1] ); // tried
}

I just want to iterate through it and get results like: 0A 0C and 0B 0D.
How can I do both of this?

Is a for loop okay? Should I use something else? Any suggestion for better performance are also welcome.

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update

I forgot to say that I have to do the actual i++ because I have to go through each byte, but I also want to be able to access the index for the buffer by twos.

So all I need is if the i is 0 then I need to get the data[i].

If the i is 2 then I need to get the data[i+1]. So on and so forth.

Answer 1

This should do it.

for (var i = 0; i < data.length; i+=2) 

Your other attempts didn't actually change the value of i. They just told the pointer to look in a different place.

EDIT: Try this:

var data = new Buffer("0A0B0C0D", "hex");
var xx=0;
for (var i = 0; i < data.length; i++) {
  console.log( data[i] ); // will iterate 1 by 1. Not what I wanted
  console.log( data[xx] );
  xx++;
  console.log( data[xx] );
  xx=0;
}

Although, I don't exactly see how that's going to help. That will just check xx and xx+1 for however many times i is run. If you wanted to check i, and i+1 at the same time, then start anew with i+2, the original answer I gave should do the trick.