Typing Effect in Javascript

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var TxtType = function(el, toRotate, period) {
	this.toRotate = toRotate;
	this.el = el;
	this.loopNum = 0;
	this.period = parseInt(period, 10) || 2000;
	this.txt = '';
	this.tick();
	this.isDeleting = false;
};

TxtType.prototype.tick = function() {
	var i = this.loopNum % this.toRotate.length;
	var fullTxt = this.toRotate[i];

if (this.isDeleting) {
		this.txt = fullTxt.substring(0, this.txt.length - 1);
	} else {
		this.txt = fullTxt.substring(0, this.txt.length + 1);
	}

this.el.innerHTML = '<span class="wrap">'+this.txt+'</span>';

var that = this;
	var delta = 200 - Math.random() * 100;

if (this.isDeleting) { delta /= 2; }

if (!this.isDeleting && this.txt === fullTxt) {
		delta = this.period;
		this.isDeleting = true;
	} else if (this.isDeleting && this.txt === '') {
		this.isDeleting = false;
		this.loopNum++;
		delta = 500;
	}

setTimeout(function() {
		that.tick();
	}, delta);
};

Typing Effect in Javascript

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