Pattern Matching

pattern-matching-10.md

iex(9)> Greeter.hello(:jane)
"Hello Jane"
iex(10)> Greeter.hello(:anna)
"Hello anna"

pattern-matching-11.md

# calculator.exs
defmodule Calculator do
  def multiply_by_two([]), do: return []

  def multiply_by_two([head | tail]) do 
    [head * 2 | multiply_by_two(tail)]
  end
end

pattern-matching-12.md

iex> Calculator.mulitply_by_two([])
[]

iex> Calculator.multiply_by_two([1, 2, 3])
[2, 4, 6]

pattern-matching-2.md

  iex> 2 = b
  2 #huh?

pattern-matching-3.md

iex> a = 1
1
iex> 2 = a
** (MatchError) no match of right hand side value: 1

pattern-matching-4.md

iex(8)> b = 2
2
iex(9)> b = 3 
3

pattern-matching-5.md

iex(1)> a = 1
1
iex(2)> b = 3 
1
iex(3)> ^b = 4 
** (MatchError) no match of right hand side value: 4

iex(3)>
[/code]

pattern-matching-6.md

iex(12)> {result, value} = {:ok,2}
{:ok, 2}
iex(13)>

pattern-matching-7.md

iex(12)> {result, value} = {:ok,2}
{:ok, 2}
iex(13)> value
2

pattern-matching-8.md

iex(12)> {:ok, value} = {:notok, 2}
** (MatchError) no match right hand side value: {:notok,2}

pattern-matching-9.md

# greeter.exs
defmodule Greeter do
  def hello(:jane), do: "Hello Jane"
  
  def hello(name) do
    "Hello #{name}"
  end
end

pattern-matching-first.md

  iex(6)> a = 1
  1
  iex(7)> b = 2 
  2

patternMatching-1.md

  iex(6)> a = 1
  1
  iex(7)> b = 2 
  2

iex(5)> 2 = b
** (CompileError) iex:5: undefined function b/0

I guess elixir doesn't support variable matching in the right side?