JSFiddle - React, Tailwind, and code Playground

JavaScript

var text = new Array();
text[0] = "welcome ".split('');
text[1] = "how are u?".split('');

function printLetter(phrase_index, letter_index) {
    var word = text[phrase_index];
    if (word) {
        if (letter_index === word.length) {
            printLetter(phrase_index + 1, 0);
        } else {
            var letter = word[letter_index];
            if (letter) {
                $('body').append('<br />' + letter);
                setTimeout(function () {
                    printLetter(phrase_index, letter_index + 1);
                }, 200);
            }
        }
    }
}
printLetter(0, 0);