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This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 9.
String codePointAt() . UTF-16 .
const icons = "";
console.log(icons.codePointAt(1));
// Expected output: "9733"
codePointAt(index)
index .
index 0 str.length - 1 , codePointAt() undefined .index UTF-16 .index UTF-16 . . 0, str str.length - 1.
0 1114111(0x10FFFF). UTF-16 0 - 65535 . 16 . codePointAt() . UTF-16 , .
"ABC".codePointAt(0); // 65
"ABC".codePointAt(0).toString(16); // 41
"".codePointAt(0); // 128525
"\ud83d\ude0d".codePointAt(0); // 128525
"\ud83d\ude0d".codePointAt(0).toString(16); // 1f60d
"".codePointAt(1); // 56845
"\ud83d\ude0d".codePointAt(1); // 56845
"\ud83d\ude0d".codePointAt(1).toString(16); // de0d
"ABC".codePointAt(42); // undefined
( , ) codePointAt() .
const str = "\ud83d\udc0e\ud83d\udc71\u2764";
for (let i = 0; i < str.length; i++) {
console.log(str.codePointAt(i).toString(16));
}
// '1f40e', 'dc0e', '1f471', 'dc71', '2764'
@@iterator for...of . codePointAt(0) .
for (const codePoint of str) {
console.log(codePoint.codePointAt(0).toString(16));
}
// '1f40e', '1f471', '2764'
[...str].map((cp) => cp.codePointAt(0).toString(16));
// ['1f40e', '1f471', '2764']
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-string.prototype.codepointat |
String.prototype.codePointAt in core-jsString.fromCodePoint()String.fromCharCode()String.prototype.charCodeAt()String.prototype.charAt()This page was last modified on 2025 2 11 by MDN contributors.
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