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Functions in Elixir
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=== Syntax === To define a function in Elixir, you use the `def` keyword followed by the function name, arguments, and body. The body consists of one or more expressions. Here's a basic example: ```elixir def hello(name) do "Hello, #{name}!" end ``` In this example, `hello` is the function name, and `name` is the argument. The body of the function is `"Hello, #{name}!"`, which is the expression that will be evaluated and returned. ### Function Arity ### Elixir supports function overloading based on the number of arguments. This means you can define multiple functions with the same name but different arities (number of arguments). The Elixir compiler determines which function to execute based on the number and types of arguments passed. ### Anonymous Functions ### In addition to named functions, Elixir also supports anonymous functions. Anonymous functions are useful when you need to pass a function as an argument to another function or store it in a variable. Here's an example of an anonymous function: ```elixir greet = fn name -> "Hello, #{name}!" end ``` The `fn` keyword is used to define the anonymous function, followed by the arguments and body. You can then invoke the anonymous function by calling it like any other function: ```elixir greet.("John") # Output: "Hello, John!" ```
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