JAVASCRIPT

string uppercase

let txt = "Hello World!";
txt = txt.toUpperCase();

convert string to uppercase

function changeToUpperCase(founder) {
  return founder.toUpperCase();
}

// calling the function 
const result = changeToUpperCase("Quincy Larson");

// printing the result to the console
console.log(result);

// Output: QUINCY LARSON

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(' ');
}

string toUpper

string a = "String";
string b = a.Replace("i", "o"); // Strong
       b = a.Insert(0, "My ");  // My String
       b = a.Remove(0, 3);      // ing
       b = a.Substring(0, 3);   // Str
       b = a.ToUpper();         // STRING
int    i = a.Length;            // 6

uppercase

/[A-Z]/  : 'must contain one uppercase'

/([a-z])/  : 'must contain one lowercase'

/(d)/  : 'must contain one number'

/(W)/  : 'must contain one special character'

UpperCase

public class Test {

   public static void main(String args[]) {
      System.out.println(Character.isUpperCase('c'));
      System.out.println(Character.isUpperCase('C'));
      System.out.println(Character.isUpperCase('
'));
      System.out.println(Character.isUpperCase('	'));
   }
}