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Add a rule of thumb to the guide. #13813

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2 changes: 2 additions & 0 deletions lib/elixir/pages/getting-started/basic-types.md
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Similarly, values like `0` and `""`, which some other programming languages consider to be "falsy", are also "truthy" in Elixir.

As a rule of thumb, use `and`, `or` and `not` when you are expecting booleans. If any of the arguments are non-boolean, use `&&`, `||` and `!`.

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## Atoms

An atom is a constant whose value is its own name. Some other languages call these symbols. They are often useful to enumerate over distinct values, such as:
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