Capitalise the first letter
1 function capitalise([first, ...rest]) {
2 return first.toUpperCase() + rest.join('');
3 };
4 capitalise('hello'); // 'Hello'
5 1 function capitalise([first, ...rest]) {
2 return first.toUpperCase() + rest.join('');
3 };
4 capitalise('hello'); // 'Hello'
5