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@ -167,8 +167,15 @@ is_dog(A) -> false.
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% A guard sequence is either a single guard or a series of guards, separated
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% by semicolons (`;`). The guard sequence `G1; G2; ...; Gn` is true if at
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% least one of the guards `G1`, `G2`, ..., `Gn` evaluates to `true`.
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is_pet(A) when is_dog(A); is_cat(A) -> true;
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is_pet(A) -> false.
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is_pet(A) when is_atom(A), (A =:= dog) or (A =:= cat) -> true;
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is_pet(A) -> false.
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% Warning: not all valid Erlang expressions can be used as guard expressions;
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% in particular, our `is_cat` and `is_dog` functions cannot be used within the
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% guard sequence in `is_pet`'s definition. For a description of the
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% expressions allowed in guard sequences, refer to this
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% [section](http://erlang.org/doc/reference_manual/expressions.html#id81912)
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% of the Erlang reference manual.
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% Records provide a method for associating a name with a particular element in a
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% tuple.
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