how to change first letter to uppercase in typescript code example

Example: capitalize first letter of all word typescript

//Altered, "capitalize all words of a string" (javascript by Grepper on Jul 22 2019) answer to compatible with TypeScript

var myString = 'abcd abcd';

capitalizeWords(text){
  return text.replace(/(?:^|\s)\S/g,(res)=>{ return res.toUpperCase();})
};

console.log(capitalizeWords(myString));

//result = "Abcd Abcd"