JavaScript Convert String to Bytes Function

Just wanted to post a quick JavaScript convert string to bytes function just for myself, but I figured someone else may find it useful:

function convertToBytes(str) {
     var bytes = [];
     
     for(var i = 0; i < str.length; ++i) {
          var charCode = str.charCodeAt(i);
          bytes = bytes.concat([charCode & 0xff, charCode / 256 >>>             0]);
     }

     return bytes;
}

And my slightly improved, ES6 compatible version:

function convertToBytes(str) {
     var bytes = [];
     
     Array.from(str).forEach((char) => {
          var charCode = char.charCodeAt(char);
          bytes = bytes.concat([charCode & 0xff, charCode / 256 >>>             0]);
     });

     return bytes;
}

That funky bytes concatenation line simply enables the function to work with Unicode characters.

All credit goes out to BrunoLM at StackOverflow.