BrooklinJazz

[1, 2] ++ [3, 4] # [1, 2, 3, 4]
[1, 2, 3] -- [1, 3] # [2]
[1, 2, 3] -- [1] # [2, 3]
[1, 2, 3] -- [3, 1] # [2]

BrooklinJazz

Enum.map([1, 2, 3], fn x -> x * 2 end) # [2, 4, 6]
Enum.sum([1, 2, 3]) # 6
Enum.map(1..3, fn x -> x * 2 end) # [2, 4, 6]
Enum.sum(1..3) # 6

map = %{"a" => 1, "b" => 2}
Enum.map(map, fn {k, v} -> {k, v * 2} end) # [{"a", 2}, {"b", 4}]

BrooklinJazz

1                        # integer
0b1010                   # 10 integer in binary
0o777                    # 511 integer in octal
0x1F                     # 31 integer in hexadecimal
1.2                      # float
:example                 # atom
"hello"                  # string
true                     # boolean
false                    # boolean
[1, 2, 3]                # list

BrooklinJazz

defmodule Greeting do
  def main do
    say_hello()
  end
  def say_hello do
    "Hello"
  end
end

Greeting.main() # Hello

BrooklinJazz

defmodule Greeting do
  def say_hello do
    "Hello"
  end
  def say_hello(name) do
    "Hello #{name}"
  end
  def say_hello(name1, name2) do
    "Hello #{name1}, Hi #{name2}"
  end

BrooklinJazz

if(true, do: "code to run when true", else: "code to run when false")
# brackets are optional
if true, do: "code to run when true", else: "code to run when false"

BrooklinJazz

if true do
 # code to run when true 
else
 # code to run when false
end

BrooklinJazz

unless false do
 # code to run when false
else
 # code to run when true
end

BrooklinJazz

case 1 do
    1 -> "the 1 path is executed"
    2 -> "the 2 path is skipped"
    _ -> "the default path is skipped"
end

case 2 do
    1 -> "the 1 path is skipped"
    2 -> "the 2 path is executed"
    _ -> "the default path is skipped"

BrooklinJazz

cond do
   5 < 3 -> "this will be skipped"
    4 == 4 and 5 > 3 -> "this code will execute"
end