Rust: dynamically building escaped unicode scalar values

Question

I want to create an escaped unicode scalar value at runtime. How can I achieve this?

let omega = "3A9";
assert_eq!("\u{3A9}", format!("\\u{{{}}}", omega))

Error: thread 'main' panicked at 'assertion failed: (left == right) left: "Ω", right: "\\u{3A9}"'

orlp · Accepted Answer · 2022-08-03 09:53:57Z

4

You want to interpret the string as an hexadecimal integer and construct a char using it.

let omega = "3A9";
let code_point = u32::from_str_radix(omega, 16).unwrap();
let s = char::from_u32(code_point).unwrap().to_string();

answered Aug 3, 2022 at 9:53

orlp

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1 Comment

Worth noting, if you control the source of the omega variable, it would be better to store it as a u32 from the beginning: let omega = 0x3A9