Text Dialog Animation

var Text = function (object) {
    this.text = object.text;
    this.el = object.el;
    this.total = this.text.length;
    this.current = 0;
    this.timeout;
    this.timeoutAnim = object.timeoutAnim || 300;
};

Text.prototype.startAnimation = function () {
    this.timeout = setInterval(() => this.animate(), this.timeoutAnim);
};

Text.prototype.animate = function () {
    this.el.innerHTML += this.text[this.current++];
    if (this.current == this.total)
        clearTimeout(this.timeout);
};

document.body.innerHTML = "";

var anim = new Text({
    text: "Olá, tudo bem? Como vai as coisas?",
    el: document.body,
    timeoutAnim: 100
});
anim.startAnimation();