Answer 1

//have a string containing your text:
var str = "Hello World"

//set the animation speed, aka interval timeout
var timeout = 1000;

//set the current char of the string (should be 0)
var char = 0

/*define the writing function(, you could place it in the interval function but its easier to explain like this)*/
const write = () => {

//set current char
let c = str[char]

/*TODO: Add you JQuery code to inject the letter to a element*/

//You could use plain js
document.getElementById("your-id").innerText(c)

char++
}

//And set an interval
setInterval(()=>{
write()
},timeout)