how to make letter capital in js code example

Example 1: capitalize in javascript

const name = 'flavio'
const nameCapitalized = name.charAt(0).toUpperCase() + name.slice(1)

Example 2: return first letter of string javascript in uppercase

function capitalizeFirstLetter(string) {
  return string.charAt(0).toUpperCase() + string.slice(1);
}

console.log(capitalizeFirstLetter('foo')); // Foo