Debounce afisha daily

debounce_afisha.js

// this is the lag source (decompiled code)
addEventScroll: function(e, t) {
    var n = this;
    e.attachEvent ? e.attachEvent("onscroll", function() {
        t.call(n)
    }) : e.addEventListener("scroll", function() {
        t.call(n)
    })
},

// FIX: use http://underscorejs.org/#debounce or directly copy debounce function
if (typeof _ === "undefined") {
    _ = {}
}

_.now = Date.now || function() {
    return new Date().getTime();
};

_.debounce = function(func, wait, immediate) {
    var timeout, args, context, timestamp, result;

    var later = function() {
        var last = _.now() - timestamp;
        
        if (last < wait && last >= 0) {
            timeout = setTimeout(later, wait - last);
        } else {
            timeout = null;
            if (!immediate) {
                result = func.apply(context, args);
                if (!timeout) context = args = null;
            }
        }
    };

    return function() {
        context = this;
        args = arguments;
        timestamp = _.now();
        var callNow = immediate && !timeout;
        if (!timeout) timeout = setTimeout(later, wait);
        if (callNow) {
            result = func.apply(context, args);
            context = args = null;
        }
        
        return result;
    };
}

// replace call being attached with debounced call
addEventScroll: function(e, t) {
    var intervalInMs = 100;
    var n = this;
    e.attachEvent ? e.attachEvent("onscroll", _.debounce(function() {
        t.call(n)
    }, intervalInMs)) : e.addEventListener("scroll", _.debounce(function() {
        t.call(n)
    }, intervalInMs))
},