Thank you for your reply，I know that there are ways to get the right results,
but I still think that there should be such a method on the prototype chain of
String, rather than by other means (mostly by converting to an array to find
the length). I hope that members of ECMA can consider it.
Javascript itself supports such a method is definitely better than the
developer alone.
There are many such requirements in a real development scenario, such as how
many characters are allowed to be entered by the user, which is something we
should consider not in Unicode for Basic Multilingual Plane. Unify the
awareness of users and developers.
```
eg.
let str = '𠮷𠮷𠮷𠮷';
[...str].length; // 4
or
Array.from(str).length // 4
```
------------------ 原始邮件 ------------------
发件人: "Claude Pache"<claude.pa...@gmail.com>;
发送时间: 2019年8月8日(星期四) 下午4:45
收件人: "fanerge"<fane...@qq.com>;
抄送: "es-discuss"<es-discuss@mozilla.org>;
主题: Re: Proposal: `String.prototype.codePointCount`
Le 8 août 2019 à 04:37, fanerge <fane...@qq.com> a écrit :
I expect to be able to add an attribute to String.prototype that returns the
number of codePoints of the string to reflect the actual number of characters
instead of the code unit.
Note however that “the number of code points” is not the same thing as “the
actual number of characters” for what a human usually perceives as “character”.
For example:
```js
Object.defineProperty(String.prototype, "codePointCount", {
get() { return [...this].length }
})
"🇨🇦".codePointCount // 2
"n̈".codePointCount // 2
"é".codePointCount // 1
"é".normalize("NFD").codePointCount // 2
```
I believe that most developers need such a method and property to get the
number of codePoints in a string.
For what purposes do “most developers” need the number of code points?
—Claude_______________________________________________
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