JSFiddle - React, Tailwind, and code Playground
JavaScript
function shorten(str) {
return str.slice(0, (function() {
for (var i=str.length; i--;) {
if (str.charAt(i).match(/[A-Z]/)) return ++i;
}
})())
}
console.log( shorten('FirstName') )
console.log( shorten('Lastname') )
console.log( shorten('BlinK333') )
console.log( shorten('Something Wicked') )