streamline code

Author: molpopgen

examples/manual_metadata_encoding.rs

@@ -55,24 +55,15 @@ impl MetadataRoundtrip for IndividualMetadata {
         let size: [u8; std::mem::size_of::<usize>()] =
             md[0..std::mem::size_of::<usize>()].try_into().unwrap();
         let size = usize::from_le_bytes(size);
-        let name =
-            str::from_utf8(&md[std::mem::size_of::<usize>()..size + std::mem::size_of::<usize>()])
-                .unwrap()
-                .to_string();
-        let offset = size + std::mem::size_of::<usize>();
-        let size: [u8; std::mem::size_of::<usize>()] = md
-            [offset..offset + std::mem::size_of::<usize>()]
-            .try_into()
-            .unwrap();
-        let size = usize::from_le_bytes(size);
-        let mut offset = offset + std::mem::size_of::<usize>();
+        let md = &md[std::mem::size_of::<usize>()..];
+        let name = str::from_utf8(&md[0..size]).unwrap().to_string();
+        let md = &md[size..];
+        let md = &md[std::mem::size_of::<usize>()..];
         let mut phenotypes = vec![];
-        for _ in 0..size {
-            let p: [u8; 4] = md[offset..offset + std::mem::size_of::<i32>()]
-                .try_into()
-                .unwrap();
-            phenotypes.push(i32::from_le_bytes(p));
-            offset += std::mem::size_of::<i32>();
+        let chunks = md.chunks_exact(std::mem::size_of::<i32>());
+        for c in chunks {
+            let a: [u8; std::mem::size_of::<i32>()] = c.try_into().unwrap();
+            phenotypes.push(i32::from_le_bytes(a));
         }
         Ok(Self { name, phenotypes })
     }