https://qiita.com/legokichi/items/0f1c592d46a9aaf9a0ea#string-str---u8-u16-u32-u64-usize-i8-i16-i32-i64-isize-f32-f64-%E6%96%87%E5%AD%97%E5%88%97%E3%81%8B%E3%82%89%E6%95%B0%E5%80%A4%E3%81%B8%E3%81%AE%E5%A4%89%E6%8F%9B ```rust // &strでもOK let str = "hoge".to_string(); let result = str.parse::<i32>().unwrap(); ```