JSFiddle - React, Tailwind, and code Playground

by WK_of_Angmar

JavaScript

function numberToFour(input) {
    var digitToWord = ["", "one", "two", "three", "four", "five", "six", "seven", "eight", "nine"];
    var exceptions = {10: "ten", 11: "eleven", 12: "twelve"};
    var numberInWords = exceptions[input.length] !== undefined ? exceptions[input.length] : digitToWord[input.length];
    if (numberInWords === input) { return numberInWords; }
    return input + "<br>" + numberToFour(numberInWords);
};

document.write(numberToFour("three"));