Question

How can I convert a character to its ASCII code using JavaScript?

For example:

get 10 from "\n".

Answer 1

"\n".charCodeAt(0); 

Here is the documentation for charCodeAt:

The charCodeAt() method returns an integer between 0 and 65535 representing the UTF-16 code unit at the given index.

The UTF-16 code unit matches the Unicode code point for code points which can be represented in a single UTF-16 code unit. If the Unicode code point cannot be represented in a single UTF-16 code unit (because its value is greater than 0xFFFF) then the code unit returned will be the first part of a surrogate pair for the code point. If you want the entire code point value, use codePointAt().

If you need to support non-BMP Unicode characters like U+1F602 , then don’t use charCodeAt, as it will not return 128514 (or 0x1f602 in hexadecimal), it will give a result you don’t expect:

console.log('\u{1f602}'.charCodeAt(0)); // prints 55357 , which is 0xd83d in hexadecimal