// Implement an asynchronous task runner that executes tasks in parallel upto a set concurrency limit. Overflow tasks are queued and executed as tasks finish.
// A "TaskRunner" Constructor takes one argument, "concurrency", and exposes one method "push" on its prototype. The "push" method takes one argument "task" which is a "function":
function TaskRunner(concurrency) {
}
TaskRunner.prototype.push = function(task) {
}
function randomTask(done) {
}
var tr = new TaskRunner(2);
tr.push(randomTask);
tr.push(randomTask);
tr.push(randomTask);
tr.push(randomTask);
// Expected Output:
// Started task 1 at 0 seconds
// Started task 2 at 0 seconds
// Started task 3 at 1.2 seconds
// Started task 4 at 3.0 seconds
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