juggle-async.js

var http = require('http');

var urls = process.argv.slice(2);
var results = [];
var done = 0;

function printResults() {
	for (var i = 0; i < 3; i++) console.log(results[i]);
}

function httpGet(index) {
	http.get(process.argv[2 + index], function (res) {
		res.setEncoding('utf8');

		var data = '';
		res.on('data', function (chunk) {
			data += chunk;
		});

		res.on('end', function () {
			results[index] = data;
			done++;
			if (done === 3) printResults();
		});
	}).on('error', function (err) {
		console.error(err);
	});
}

for (var i = 0; i < 3; i++) httpGet(i);