Elixir basics-2
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Functions are the core of Elixir. There are two types: anonymous functions defined with fn/end and named functions defined inside modules. Anonymous functions are closures that can access outer scope bindings. Named functions can be public or private and allow default parameters and pattern matching. Pattern matching selects function clauses by matching argument patterns. Guards extend pattern matching with conditional checks. Functions transform data rather than change it, making Elixir functional.
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- 2. Agenda ● Functions in Elixir – Anonymous functions – Named functions – Pattern Matching – Guards ● Case EcCart
- 3. Eixir – Functions ● Elixir is a functional language, and functions are the engine. ● The purpose of functions is to transform data, not to change data. ● Two “types” of functions: – Anonymous functions – Named functions
- 4. Elixir – Anonymous Functions ● Anonymous functions are delimited by the keywords fn and end. ● fn parameter-list -> body parameter-list -> body end ● Defined as: ● Used as:
- 5. Elixir – Anonymous Functions ● Anonymous functions needs to have the same arity on the parameter list.
- 6. Elixir – Anonymous Functions ● Order in defined clauses is important
- 7. Elixir – Anonymous Functions ● Are closures – The scope encloses the bindings of its variables, packaging them into something that can be saved and used later.
- 8. Elixir – Anonymous Functions Sample: :::::::::::::: exists.txt :::::::::::::: Hello world
- 9. Elixir – Anonymous Functions & notation It’s a short helper Is the same as:
- 10. Elixir – Modules and Named Functions ● Named functions are defined inside of a module in order to organize and give structure to your code.
- 11. Elixir – Functions ● Pattern matching
- 12. Elixir – Functions ● Pattern matching
- 13. Elixir – Functions ● Guards – Are an extension of the basic pattern-matching mechanism. – Can be specified providing the when clause after the arguments list.
- 14. Elixir – Functions ● Guards
- 15. Elixir – Functions ● Limitations of guards – Comparison Operators ● ==, !=, ===, !==, >, <, <=, >= – Boolean and negation operators ● Or, and, not, ! (not allowed: ||, && ) – Aritmetic operators ● +, -, *, / – Join Operators ● ++ <> – In operator ● 5 in (0..6) – Type-check functions ● Is_atom, ... is_* – Some other functions ● abs(number), length(list) ...
- 16. Elixir – Functions ● Default params
- 17. Elixir – Modules and Named Functions ● Private functions
- 18. Elixir – Summary ● Functions are the engine of Elixir – Named functions ● Needs to be defined on a module ● Are identified by name and arity ● Could be public or private ● The arguments could have a default value – Anonymous functions ● Are typed as functions – pass/returned by other ● Parameter list must have the same number of arguments – Use pattern matching to select the right clause – The order of the matching clauses is important
- 19. Elixir – Ec.Cart ● https://hex.pm/packages/ec_cart
- 20. References ● NY: Manning Publications. ● Thomas, D. (2016). Programming Elixir 1.3: functional, concurrent, pragmatic, fun. Releigh, NC: Pragmatic Bookshelf.