TwistingTwists
Journal : Designing Elixir systems with OTP
This is my Journal for readings on Designing Elixir Systems with OTP.
Will post chapter 01 tomorrow! Stay tuned!
Most Liked
AstonJ
Nice one TT! Another book I am interested in reading at some point! 
3
TwistingTwists
Chapter 01
Concepts / RE-Thinks:
DFTwBLWB : Do Fun things with Big Loud Worker Bees - acronym to think about layering application.
DFT = for building blocks of project
BLWB = for letting components work together.
Why layers?
- Testing each component with SIMILAR functions together (because they are grouped together! )
- Healing - supervisors
- the concept is (called
lifecycle) as simple as turn-off the TV and restart tofixit! - So, shut down CLEANLY (note,emphasis)!
- the concept is (called
Managing state :
- recursion and message passing to manage state.
- This is new! = message passing is usually an advanced concept and not ‘generally’ used to manage state, unless - Elixir or MVC model.
3
TwistingTwists
Chapter 02 : Know Your Elixir Datatypes
Types and pro-cons
| DataType | Properties | Pro | Cons |
|---|---|---|---|
| Atoms | are integer + constant + NOT garbage collected | use = name concepts + constant tables type lookup | NOT convert user-input to atom |
| Arrays = NOT in Elixir! | - | random access is cheap + traversing O(n) + | |
| Lists | NOT arrays! + singly linked-lists + | pattern matching on head is O(1) | Appending at END of lists or LARGE lists |
| Maps | random access O(log n) => useful for heavily edited data | use MapSet when only Keys (uniqueness) | |
| Strings | are binaries => efficiently stored + copy is a FULL copy (unlike lists) | DO NOT LET processes hold references to long string => may cause memory leaks + NOT use long strings for storing info + DONT concatenate | |
| Tuples | fixed length data structure | use for tagging data + read chunks of data like csv | slow append => don’t edit (if need to, use Maps) |
| Functions | send function to data, NOT data to function | ||
| PATTERN matching | allows multiple dimension inheritance (sort of) => better than inheritance!! |
3
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