So what's wrong with `Array.from(str).length`?
On Thursday, August 8, 2019 4:37:07 AM CEST fanerge wrote: > 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. > > > > > > Definition of String.prototype.length > > > > This property returns the number of code units in the string. UTF-16, the > string format used by JavaScript, uses a single 16-bit code unit to > represent the most common characters, but needs to use two code units for > less commonly-used characters, so it's possible for the value returned by > length to not match the actual number of characters in the string. > > We refer to the String class in Java > > The String class in the Java JVM uses UTF-16 encoding. > String.length(): The method returns the number of characters in char in the > string; String.codePointCount(): The method returns the number of > codewords in the string. > > > > > > I want the ECMA organization to be able to add a property or method to > String.prototype that returns the value of the codePoint of the string. For > example: String.prototype.codePointCount can return the actual number of > codePoints instead of code unit. > ``` > > const str1 = ‘1111’; > > str1.length; // 4 > > str1.codePointCount; // 4 > > // ‘1’.codePointAt(0) // 49 > > > > > const str2 = '𠮷𠮷𠮷𠮷’; > > str2.length; // 8 > > str2.codePointCount; // 4 > > // '𠮷'.codePointAt(0); // 134071 > > > > > const str3 = ‘😯😯😯😯’; > > str3.length; // 8 > > str3.codePointCount; // 4 > > > > // '😯'.codePointAt(0); // 128559 > > ``` > > > > I believe that most developers need such a method and property to get the > number of codePoints in a string. I sincerely hope that you can accept my > proposal, thanks.
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