js
var through = require('through2');
var Ordered = require('ordered-read-streams');

var s1 = through.obj(function (data, enc, next) {
  var self = this;
  setTimeout(function () {
    self.push(data);
    next();
  }, 200)
});
var s2 = through.obj(function (data, enc, next) {
  var self = this;
  setTimeout(function () {
    self.push(data);
    next();
  }, 30)
});
var s3 = through.obj(function (data, enc, next) {
  var self = this;
  setTimeout(function () {
    self.push(data);
    next();
  }, 100)
});

var streams = new Ordered([s1, s2, s3]);
streams.on('data', function (data) {
  console.log(data);
})

s1.write('stream 1');
s1.end();

s2.write('stream 2');
s2.end();

s3.write('stream 3');
s3.end();

stream 1
stream 2
stream 3