Add ByteArray.reverse

Similar to Array.reverse this reverses the values in-place.

Changelog: added

libstd/src/std/byte_array.inko

@@ -254,6 +254,29 @@ class builtin ByteArray {
   fn pub iter -> Bytes {
     Bytes { @bytes = self, @index = 0 }
   }
+
+  # Reverses `self` in-place
+  #
+  # # Examples
+  #
+  #     let a = ByteArray.from_array([10, 20, 30])
+  #
+  #     a.reverse
+  #
+  #     a # => ByteArray.from_array([30, 20, 10])
+  fn pub mut reverse {
+    let mut a = 0
+    let mut b = length - 1
+
+    while a < b {
+      let a_val = _INKO.byte_array_get(self, a)
+
+      _INKO.byte_array_set(self, a, _INKO.byte_array_set(self, b, a_val))
+
+      a += 1
+      b -= 1
+    }
+  }
 }
 
 impl Drop for ByteArray {

libstd/test/std/test_byte_array.inko

@@ -226,4 +226,12 @@ fn pub tests(t: mut Tests) {
     t.equal(iter.read_all(buff), 0)
     t.equal(buff.to_string, 'foo')
   }
+
+  t.test('ByteArray.reverse') fn (t) {
+    let vals = ByteArray.from_array([10, 20, 30])
+
+    vals.reverse
+
+    t.equal(vals, ByteArray.from_array([30, 20, 10]))
+  }
 }