Blog post 2 - The Magic of Pattern Matching in Elixir

1.ex

[a, b, c] = [:pattern, "matching", 100]

a #=> :pattern
b #=> "matching"
c #=> 100

2.ex

%{first_name: first_name} =
  %{first_name: "Javed", last_name: "Akhtar"}

first_name #=> "Javed"

3.ex

%{middle_name: middle_name} =
  %{first_name: "Javed", last_name: "Akhtar"}

** (MatchError) no match of right hand side value

4.ex

%{first_name: first_name, last_name: "Akhtar"} =
  %{first_name: "Javed", last_name: "Akhtar"}

first_name #=> "Javed"

5.ex

%{first_name: first_name, last_name: "Smith"} =
  %{first_name: "Javed", last_name: "Akhtar"}

** (MatchError) no match of right hand side value

6.ex

def process_integer(value) do
  case value do
    1 -> {:ok, "one"}
    2 -> {:ok, "two"}
    3 -> {:ok, "three"}
    _ -> :error
end

7.ex

def process_integer(1), do: {:ok, "one"}
def process_integer(2), do: {:ok, "two"}
def process_integer(3), do: {:ok, "three"}
def process_integer(_), do: :error