JSFiddle - React, Tailwind, and code Playground

JavaScript

var text1 = "helloWorld";
var text2 = "ThisIsOnlyATest";
var text3 = "word"

function splitCamelCase(s) {
    return s.split(/(?=[A-Z])/).join(' ');
}

alert(splitCamelCase(text1));
alert(splitCamelCase(text2));
alert(splitCamelCase(text3));