String.prototype.normalize()

const name1 = "\u0041\u006d\u00e9\u006c\u0069\u0065";
const name2 = "\u0041\u006d\u0065\u0301\u006c\u0069\u0065";

console.log(`${name1}, ${name2}`);
// Expected output: "Amlie, Amlie"
console.log(name1 === name2);
// Expected output: false
console.log(name1.length === name2.length);
// Expected output: false

const name1NFC = name1.normalize("NFC");
const name2NFC = name2.normalize("NFC");

console.log(`${name1NFC}, ${name2NFC}`);
// Expected output: "Amlie, Amlie"
console.log(name1NFC === name2NFC);
// Expected output: true
console.log(name1NFC.length === name2NFC.length);
// Expected output: true

str.normalize([form]);

//  

// U+1E9B: LATIN SMALL LETTER LONG S WITH DOT ABOVE
// U+0323: COMBINING DOT BELOW
var str = "\u1E9B\u0323";

//    (NFC)

// U+1E9B: LATIN SMALL LETTER LONG S WITH DOT ABOVE
// U+0323: COMBINING DOT BELOW
str.normalize("NFC"); // '\u1E9B\u0323'
str.normalize(); //   

//    (NFD)

// U+017F: LATIN SMALL LETTER LONG S
// U+0323: COMBINING DOT BELOW
// U+0307: COMBINING DOT ABOVE
str.normalize("NFD"); // '\u017F\u0323\u0307'

//    (NFKC)

// U+1E69: LATIN SMALL LETTER S WITH DOT BELOW AND DOT ABOVE
str.normalize("NFKC"); // '\u1E69'

//    (NFKD)

// U+0073: LATIN SMALL LETTER S
// U+0323: COMBINING DOT BELOW
// U+0307: COMBINING DOT ABOVE
str.normalize("NFKD"); // '\u0073\u0323\u0307'

//   

// U+D55C: (HANGUL SYLLABLE HAN)
// U+AE00: (HANGUL SYLLABLE GEUL)
var first = "\uD55C\uAE00";

//    (NFD)
//    , ,   .
//    ''     .

// U+1112: (HANGUL CHOSEONG HIEUH)
// U+1161: (HANGUL JUNGSEONG A)
// U+11AB: (HANGUL JONGSEONG NIEUN)
// U+1100: (HANGUL CHOSEONG KIYEOK)
// U+1173: (HANGUL JUNGSEONG EU)
// U+11AF: (HANGUL JONGSEONG RIEUL)
var second = first.normalize("NFD"); // '\u1112\u1161\u11AB\u1100\u1173\u11AF'

//    (NFC)
//       .

// U+D55C: (HANGUL SYLLABLE HAN)
// U+AE00: (HANGUL SYLLABLE GEUL)
var third = second.normalize("NFC"); // '\uD55C\uAE00'

console.log(second === third); //    false .