CRC: input |> construct |> reduce |> convert

data type definition.

defmodule Counter do
  # construct
  def new(input) do
    String.to_integer(input)
  end

  # reduce
  def add(acc, number) do
    acc + number
  end

  # convert
  def show(acc) do
    "The ants arrrr is #{acc}"
  end
end

input = "42"

import Counter

input 
|> new() 
|> add(1) 
|> add(1) 
|> add(-1) 
|> show()

input = "0"
list_of_numbers = [1, 2, 3]
Enum.reduce(list_of_numbers, Counter.new(input), fn i, acc -> Counter.add(acc, i) end) |> Counter.show()

[first, second, third] = list_of_numbers
input 
|> Counter.new()
|> Counter.add(first)
|> Counter.add(second)
|> Counter.add(third)
|> Counter.show()

Workshop Goals

Topics (ADD)

• Blind spots
  • [x] mutability
  • [ ] keyword list
  • [ ] sigils
  • [ ] for comprehension
  • [x] strings/charlists
• OTP and Behavior
  • [x] Base Elixir (counter core)
  • [ ] GenServers
    • [ ] Supervision
    • [ ] Behaviours
• Phoenix Lifecycle
  • [ ] Endpoints
  • [ ] Application
  • [ ] GraphQL

    - [ ] Batch

• LLM
  • [x] throw it away
  • [ ] Red/Green indicators
  • [ ] Skills
  • [ ] Usage Rules
  • [ ] Tidewave

Charlists

charlists are a blind spot because Ruby uses both “ and ‘ for strings, but in Elixir they are different!

<<99, 97, ?t>>

[99, 97, 116]

'cat'

"cat" == ~c"cat"

[99, 97, 116]