how to convert a string to UpperCase code example

Example 1: string to uppercase

const upperCase = function(names){
    const toLower = names.toLowerCase().split(' ');
    const namesUpper = [];
    for(const wordName of toLower){
        namesUpper.push(wordName[0].toUpperCase() + wordName.slice(1));
    }
    return namesUpper.join(' ');
}

Example 2: convert to uppercase

echo example | awk -F 'd' '{ print toupper($1)}'
EXAMPLE		#Example first uppercased outputed