Why not make the map an index into a slice of Animal if you're already going for immutability? Simpler/faster to iterate.
type AnimalMap struct {
index map[string]int
items []Animal
}
(The key lookup would become am.items[am.index["value"]])
If you were going for mutability, it'd be simpler to make the index map[string]*Animal (which might not be a bad idea even with immutable access – of course the index matters more/less depending on how much you'd be inserting/deleting.).
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Why not make the
mapan index into a slice ofAnimalif you're already going for immutability? Simpler/faster to iterate.(The key lookup would become
am.items[am.index["value"]])If you were going for mutability, it'd be simpler to make the index
map[string]*Animal(which might not be a bad idea even with immutable access – of course the index matters more/less depending on how much you'd be inserting/deleting.).