buffer.toString([encoding], [start], [end])

var b = new Buffer(50);   console.log(b);   var c = b.toString('base64',0,10);   console.log(c);

// toString(encoding, start=0, end=buffer.length) Buffer.prototype.toString = function(encoding, start, end) {   var loweredCase = false;   start = start >>> 0;   end = util.isUndefined(end) ? this.length : end >>> 0;   if (!encoding) encoding = 'utf8';   if (start < 0) start = 0;   if (end > this.length) end = this.length;   if (end <= start) return '';   while (true) {     switch (encoding) {       case 'hex':         return this.hexSlice(start, end);       case 'utf8':       case 'utf-8':         return this.utf8Slice(start, end);       case 'ascii':         return this.asciiSlice(start, end);       case 'binary':         return this.binarySlice(start, end);       case 'base64':         return this.base64Slice(start, end);       case 'ucs2':       case 'ucs-2':       case 'utf16le':       case 'utf-16le':         return this.ucs2Slice(start, end);       default:         if (loweredCase)           throw new TypeError('Unknown encoding: ' + encoding);         encoding = (encoding + '').toLowerCase();         loweredCase = true;     }   } };