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=== Parameters === Functions in Elixir can have zero or more parameters. Parameters allow us to pass values to the function and use them within its body. Elixir supports both positional and keyword parameters. Positional parameters are identified by their position in the parameter list, while keyword parameters are identified by their name. Here's an example of a function with both positional and keyword parameters: ```elixir def greet(name, age: 20) do IO.puts("Hello, #{name}! You are #{age} years old.") end ```
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