how to get the first letter in a string to upper case code example

Example 1: return first letter of string javascript in uppercase

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

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

Example 2: make first letter uppercase

const publication = "freeCodeCamp";
publication[0].toUpperCase() + publication.substring(1);