Tombarr

defmodule Math do
  @spec add(number, number) :: number
  def add(a, b), do: a + b
end

Tombarr

public class AnnotationExample {
  @Override
  public String toString() {
    return "AnnotationExample";
  }
}

Tombarr

# Lambdas with one parameter
[1, 2, 3] |> Enum.map(fn x -> x * x end) # [1, 4, 9]

# Lambdas with multiple parameters
[1, 2, 3] |> Enum.reduce(fn x, s -> x + s end) # 6

Tombarr

var twentyFour = 24;
let notTrue = false;
const API_KEY = 'abc123';

Tombarr

twenty_four = 24
not_true = false
API_KEY = 'abc123'

Tombarr

let [x, y, z] = [1, 2, 3];
let {status, message} = {status: "OK", message: "Unknown error"};
let [first, ...everythingElse] = [1, 2, 3, 4, 5]

Tombarr

[x, y, z] = [1, 2, 3]
{status, message} = {:error, "Unknown error"}
[first | everythingElse] = [1, 2, 3, 4, 5]

Tombarr

let n = 10;
n--; // same as n -= 1;
n++; // same as n += 1;

Tombarr

[1, 2, 3] ++ [4, 5, 6] # [1, 2, 3, 4, 5, 6]
[1, 2, 3] -- [2] # [1, 3]

Tombarr

let map = {
  red: "blue",
  1: 2,
  true: false
};

map[true]; // false
map["red"]; // "blue"