AutoQueue: A queue that runs the given process with an interval if some values are queued and stops if there is no value queued.

auto_queue.js

/**
 * class AutoQueue
 * 
 * queue that runs the given process with an interval if some values are queued
 * and stops if there is no value queued.
 * 値がqueueされていれば一定間隔で与えられた関数に値を渡し、queueされていなければ黙っているqueue.
 * 
 * @constructor
 * @param {Function} func
 * @param {number}   interval
 */
var AutoQueue = function(func, interval) {
    p = Promise.resolve();
    /**
     * function push
     * @param {any} val: value to be passed to the given "func"
     */
    this.push = function(val) {
        p = p.then(function() {
            func(val);
            return new Promise(function (resolve) { setTimeout(resolve, interval); });
        });
    };
};

// Usage example below
var q = new AutoQueue(function(n) {
    console.log(n*n); return n*n;
}, 1000);

// queueing
for (var i = 0; i < 10; i++)
    q.push(i);