Elixir basic

1. Elixir
Toan Ha

3. What
- Programming language born in ~1986 and in use for ~30 years
- Designed by Ericsson for a specific kind of systems (industrial/business
driven design)

4. Goals
- Easier to reason about
- Easier to do it right
- More maintainable
- More concise

5. How
- Immutable data
- Actor model concurrency
- Really lightweight (think millions)
- Shares nothing (no locks, no mutexes)
- Communicate with asynchronous messages
- Hot swapping (upgrade without downtime)
- Extremely good at fault handling (let it crash)
- Incredibly robust platform (BEAM)

6. What’s wrong with Erlang?
Nothing! As nothing is wrong with C or ASSEMBLY

11. Basic type

12. Atom
Atoms are constants where their name is their own value.
Some other languages call these symbols:

13. Anonymous functions

14. Linked Lists

15. Tuples

16. Pattern Matching

17. if, if else
if nil do
"This won't be seen"
else
"This will"
end

18. case

19. cound

20. What is the difference between cond and case?
cond receives no arguments, and it allows
you to use a different condition in each
branch.
case receives an argument, and every
branch is pattern-matched against the
argument.

21. do
if true, do: 1 + 2
if false, do: :this, else: :that

22. Keyword lists
- Keys must be atoms.
- Keys are ordered, as specified by
the developer.
- Keys can be given more than once.

23. Maps
- Maps allow any value as a key.
- Maps’ keys do not follow any ordering.

25. Maps
- If you pass duplicate keys when creating a map, the last one wins:
- When all the keys in a map are atoms, you can use the keyword syntax for
convenience:

26. Dicts
In Elixir, both keyword lists and maps are called dictionaries. In other words, a
dictionary is like an interface (we call them behaviours in Elixir) and both keyword
lists and maps modules implement this interface.

27. Modules

29. Function capturing

30. Using in action
https://gist.github.com/rubikill/8f83f399cc6c5fe692ac

31. Default arguments

32. Recursion

33. alias, require and import
- alias allows you to set up
aliases for any given module
name. Imagine our Math
module uses a special list
implementation for doing math
specific operations:

34. require
In general a module does not need to be required before usage, except if we want
to use the macros available in that module

35. import
We use import whenever we want to easily access functions or macros from other
modules without using the fully-qualified name.

36. struct

37. struct
However, since structs are just maps, they work with the functions from the Map
module

38. Protocols
Protocols are a mechanism to achieve polymorphism in Elixir. Dispatching on a
protocol is available to any data type as long as it implements the protocol. Let’s
see an example.

41. try, catch and rescue

45. Thank you