I’m watching ECMA-262 (JavaScript 5 edition) and cannot understand what is “code unit value”?
Can anyone tell me?
Thank you very much!
I’m watching ECMA-262 (JavaScript 5 edition) and cannot understand what is code unit value?
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I’m watching ECMA-262 (JavaScript 5 edition) and cannot understand what is “code unit value”?
Can anyone tell me?
Thank you very much!
A JavaScript string is a sequence of unsigned 16-bit integers, also known as code units.
A code point is how the Unicode standard represents symbols and non-symbols. Code points are represented as a four-to-six digit hexadecimal number, typically prefixed with
U+, e.g. U+0061 LATIN SMALL LETTER A.The difference is that what can be part of a code unit depends on the character encoding that is used. A code point however, is merely the concept of a “character” that can then potentially be encoded using UTF-8, for example.
For more information, read chapter 2 of the Unicode spec, especially 2.4 Code points and characters.