0.js

// Predict and explain first...
//  =============> When we call capitalise("fay"), it will throw an error instead of returning "Fay"

// call the function capitalise with a string input
// interpret the error message and figure out why an error is occurring

// =============> "str" has already been declared, in JavaScript we can not redeclare a parameter using let inside the same scope.
// =============> write your new code here
function capitalise(str) {
  return str = `${str[0].toUpperCase()}${str.slice(1)}`;
}
console.log(capitalise("fay"));