JSFiddle - React, Tailwind, and code Playground

JavaScript

function initButtons() {
    var body = document.body,
        button, i;

    for (i = 0; i < 5; i++) {
        (function(i) {
            button = document.createElement("button");
            button.innerHTML = "Button " + i;
            button.addEventListener("click", function (e) {
                alert(i);
            }, false);
            body.appendChild(button);
        }(i));
    }
}
initButtons();