2021-05-04 00:11:14 +02:00
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# Converting between different String types in Rust
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```
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let s: String = ...
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let st: &str = ...
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let u: &[u8] = ...
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let b: [u8; 3] = b"foo"
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let v: Vec<u8> = ...
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let os: OsString = ...
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let ost: OsStr = ...
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From To Use Comment
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---- -- --- -------
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&str -> String String::from(st)
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&str -> &[u8] st.as_bytes()
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&str -> Vec<u8> st.as_bytes().to_owned() via &[u8]
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2021-11-15 01:13:52 +01:00
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&str -> &OsStr OsStr::new(st)
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2021-05-04 00:11:14 +02:00
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String -> &str &s alt. s.as_str()
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String -> &[u8] s.as_bytes()
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String -> Vec<u8> s.into_bytes()
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String -> OsString OsString::from(s)
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&[u8] -> &str str::from_utf8(u).unwrap()
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&[u8] -> String String::from_utf8(u).unwrap()
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&[u8] -> Vec<u8> u.to_owned()
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&[u8] -> &OsStr OsStr::from_bytes(u) use std::os::unix::ffi::OsStrExt;
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[u8; 3] -> &[u8] &b[..] byte literal
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[u8; 3] -> &[u8] "foo".as_bytes() alternative via utf8 literal
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Vec<u8> -> &str str::from_utf8(&v).unwrap() via &[u8]
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Vec<u8> -> String String::from_utf8(v)
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Vec<u8> -> &[u8] &v
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Vec<u8> -> OsString OsString::from_vec(v) use std::os::unix::ffi::OsStringExt;
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&OsStr -> &str ost.to_str().unwrap()
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&OsStr -> String ost.to_os_string().into_string() via OsString
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.unwrap()
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&OsStr -> Cow<str> ost.to_string_lossy() Unicode replacement characters
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&OsStr -> OsString ost.to_os_string()
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&OsStr -> &[u8] ost.as_bytes() use std::os::unix::ffi::OsStringExt;
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OsString -> String os.into_string().unwrap() returns original OsString on failure
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OsString -> &str os.to_str().unwrap()
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OsString -> &OsStr os.as_os_str()
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OsString -> Vec<u8> os.into_vec() use std::os::unix::ffi::OsStringExt;
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```
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## Source
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Original source is [this document on Pastebin](https://web.archive.org/web/20190710121935/https://pastebin.com/Mhfc6b9i)
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