function debounce(fn, debounceTime) {
    if (typeof fn !== "function") {
        throw "debounce arg is not a function";
    }

    var time = debounceTime || 300;
    var timeout;

    return function() {
        if (timeout) {
            clearTimeout(timeout);
            timeout = undefined;
        }

        timeout = setTimeout(fn, time);
    };
}

function throttle(fn, throttleTime) {
    if (typeof fn !== "function") {
        throw "throttle arg is not a function";
    }

    var time = throttleTime || 300;
    var scheduled = -1; // initial = -1, set - 1,  not set = 0

    return function() {
        if (scheduled === 1) {
            return;
        }

        setTimeout(function() {
            fn();
            scheduled = 0;
        }, time);

        scheduled = 1;
    };
}