JSFiddle - React, Tailwind, and code Playground

JavaScript

var test = 'It-is-a-great-day-today';

function camelize(str) {
    return str[0].toLowerCase() + str.replace(/-([a-z])/g, function(a, b) {
        return b.toUpperCase();
    }).slice(1);
}

console.log(camelize(test));