buffer.slice([start], [end])

var buf1 = new Buffer(26); for (var i = 0 ; i < 26 ; i++) {   buf1[i] = i + 97; // 97 is ASCII a } var buf2 = buf1.slice(0, 3); console.log(buf2.toString('ascii', 0, buf2.length)); buf1[0] = 33; console.log(buf2.toString('ascii', 0, buf2.length)); // abc // !bc

// TODO(trevnorris): currently works like Array.prototype.slice(), which // doesn't follow the new standard for throwing on out of range indexes. Buffer.prototype.slice = function(start, end) {   var len = this.length;   start = ~~start;   end = util.isUndefined(end) ? len : ~~end;   if (start < 0) {     start += len;     if (start < 0)       start = 0;   } else if (start > len) {     start = len;   }   if (end < 0) {     end += len;     if (end < 0)       end = 0;   } else if (end > len) {     end = len;   }   if (end < start)     end = start;   var buf = new NativeBuffer();   sliceOnto(this, buf, start, end);   buf.length = end - start;   if (buf.length > 0)     buf.parent = util.isUndefined(this.parent) ? this : this.parent;   return buf; };