TwistingTwists

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!

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AstonJ

AstonJ

Nice one TT! Another book I am interested in reading at some point! :003:

TwistingTwists

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?

  1. Testing each component with SIMILAR functions together (because they are grouped together! )
  2. Healing - supervisors
    1. the concept is (called lifecycle) as simple as turn-off the TV and restart to fix it!
    2. So, shut down CLEANLY (note,emphasis)!

Managing state :

  1. 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.
TwistingTwists

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!!

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