function buttonsWithLet(count, targetElement) {
    var _loop = function (i) {
        button = makeButton("alert " + i);
        button.onclick = function () {
            alert("This is button " + i + ".");
        };
        targetElement.appendChild(button);
    };
    for (var i = 1; i <= count; i += 1) {
        var button;
        _loop(i);
    }
}

function buttonsWithVarAndIIFE(count, targetElement) {
    for (var i = 1; i <= count; i += 1) {
        var button = makeButton("alert " + i);
        button.onclick = (function (i) {
            return function () {
                alert("This is button " + i + ".");
            };
        })(i);
        targetElement.appendChild(button);
    }
}