How to convert string to lowercase in move?

[0xmaayan]

Discord user ID

0xN0rd

Describe your question in detail.

hi, how to convert string to lowercase in move?
.to_lowercase() is not working

What error, if any, are you getting?

No response

What have you tried or looked at? Or how can we reproduce the error?

N/A

Which operating system are you using?

Windows

Which SDK or tool are you using? (if any)

TypeScript SDK

Describe your environment or tooling in detail

No response

[CapCap]

Hi! There isn't a built in yet, but something like the following would work for ascii strings:

    use std::string::{Self, String};
    use std::vector;

    public fun to_lowercase(s: &String): String {
        let bytes = string::bytes(s);
        let lowercased_bytes = vector::map_ref<u8, u8>(bytes, |byte| {
            let byte = *byte;
            if (byte >= 65 && byte <= 90) {
                byte + 32
            } else {
                byte
            }
        });
        string::utf8(lowercased_bytes)
    }