ascii2str

buf.js

//nodejs v6.4.0

console.log("Hello, World!");

var s = 's';
var charCode = s.charCodeAt(0);
console.log(charCode);

var buf = Buffer.from([charCode], 'ascii');
console.log(buf.toString());

var y = '2122234041424344457B7C7D7E7F';


var bufHex = Buffer.allocUnsafe(0);

bufHex = Buffer.concat([bufHex, Buffer.from(y, 'hex')]);

console.log(bufHex, bufHex.toString());