Най-добрият начин за преобразуване на низ в най-горния регистър ръчно

Примерен код

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най-добрият начин за преобразуване на низ в най-горния регистър ръчно

function myToUpperCase(str) {
  var newStr = '';
  for (var i=0;i<str.length;i++) {
    var thisCharCode = str[i].charCodeAt(0);
    if ((thisCharCode>=97 && thisCharCode<=122)||(thisCharCode>=224 && thisCharCode<=255)) {
    	newStr += String.fromCharCode(thisCharCode - 32);
    } else {
    	newStr += str[i];
    }
  }
  return newStr;
}
console.log(myToUpperCase('helLo woRld!')); // => HELLO WORLD!
console.log(myToUpperCase('üñïçødê')); // => ÜÑÏÇØDÊ

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