The String codePointAt() method

Feb 16, 2019

Learn how the JavaScript codePointAt() method returns the full Unicode code point of a character, handling symbols that need two 16-bit units in one call.

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This was introduced in ES2015 to handle Unicode characters that cannot be represented by a single 16-bit Unicode unit, but need 2 instead.

Using charCodeAt() you need to retrieve the first, and the second, and combine them. Using codePointAt() you get the whole character in one call.

For example, this chinese character ”𠮷” is composed by 2 UTF-16 (Unicode) parts:

"𠮷".charCodeAt(0).toString(16) //d842
"𠮷".charCodeAt(1).toString(16) //dfb7

If you create a new character by combining those unicode characters:

"\ud842\udfb7" //"𠮷"

You can get the same result usign codePointAt():

"𠮷".codePointAt(0) //20bb7

If you create a new character by combining those unicode characters:

"\u{20bb7}" //"𠮷"

More on Unicode and working with it in Unicode and UTF-8.

Tagged: JavaScript · All topics

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