Elixir Engine

Functions

Elixir Default Arguments

Default Arguments

Elixir default arguments use \\ for optional parameters.

Introduction to Default Arguments in Elixir

In Elixir, default arguments allow you to define functions with optional parameters. This feature provides flexibility in how functions are called, making your code more adaptable and easier to use. Default arguments in Elixir are specified with the \\ operator.

Syntax of Default Arguments

To define a function with default arguments in Elixir, you need to use the \\ operator followed by the default value. Here's a basic syntax example:

How Default Arguments Work

In the example above, the say_hello function can be called with or without an argument. If no argument is provided, it defaults to "World". Below are examples of how this function can be used:

Multiple Default Arguments

Elixir also supports functions with multiple default arguments. The following example shows a function with two optional parameters:

Here's how you can call the add function with different numbers of arguments:

Considerations with Default Arguments

When using default arguments, remember that Elixir will create multiple function heads for each combination of arguments. This means that functions with many default arguments can increase the number of function clauses significantly. Always consider the potential complexity when using this feature extensively.

Conclusion

Default arguments in Elixir are a powerful feature that enhances the flexibility of your functions. By allowing optional parameters, you can create functions that are both versatile and easy to use. However, be mindful of the complexity that can arise from excessive use of default arguments.

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