JSFiddle - React, Tailwind, and code Playground

HTML

<div>nope</div>

JavaScript

var string = "this-is-a-slug";
convert = string.replace(/-/g," ");
function ucwords (str) {
    // http://kevin.vanzonneveld.net
    // +   original by: Jonas Raoni Soares Silva (http://www.jsfromhell.com)
    // +   improved by: Waldo Malqui Silva
    // +   bugfixed by: Onno Marsman
    // +   improved by: Robin
    // +      input by: James (http://www.james-bell.co.uk/)
    // +   improved by: Kevin van Zonneveld (http://kevin.vanzonneveld.net)
    // *     example 1: ucwords('kevin van  zonneveld');
    // *     returns 1: 'Kevin Van  Zonneveld'
    // *     example 2: ucwords('HELLO WORLD');
    // *     returns 2: 'HELLO WORLD'
    return (str + '').replace(/^([a-z])|\s+([a-z])/g, function ($1) {
        return $1.toUpperCase();
    });
}
var result = ucwords(convert)
$("div").text(result);