PubNub Rate Limiting vs. Throttling Messages in AngularJS http://stackoverflow.com/questions/18364918/throttling-pubnub-requests-in-angluarjs

limit.js

//
// Listen for messages and process all messages at steady rate limit.
//
pubnub.subscribe({
    channel : "hello_world",
    message : limit( function(message) { 

        // process your messages at set interval here.

    }, 500 /* milliseconds */ )
});

//
// Rate Limit Function
//
function limit( fun, rate ) {
    var queue = [];

    setInterval( function() {
        var msg = queue.shift();
        msg && fun(msg);
    }, rate );

    return function(message) { queue.push(message) };
}

thrimit.js

//
// Listen for events and process last message each 500ms.
//
pubnub.subscribe({
    channel : "hello_world",
    message : thrimit( function( last_message, all_messages ) { 

        // process your last message here each 500ms.

    }, 500 /* milliseconds */ )
});

//
// Throttle + Limit Function
//
function thrimit( fun, rate ) {
    var last;
    var queue = [];

    setInterval( function() {
        last !== null && fun( last, queue );
        last   = null;
        queue  = []
    }, rate );

    return function(message) {
        last = message;
        queue.push(message);
    };
}

throttle.js

//
// Listen for events and process last message each 500ms.
//
pubnub.subscribe({
    channel : "hello_world",
    message : throttle( function(message) { 

        // process your last message here each 500ms.

    }, 500 /* milliseconds */ )
});

//
// Throttle Function
//
function throttle( fun, rate ) {
    var last;

    setInterval( function() {
        last !== null && fun(last);
        last = null;
    }, rate );

    return function(message) { last = message };
}