Symbols used in Elixir

https://hexdocs.pm/elixir/Kernel.html

Operators

• === (strict)
• !== (strict)
• == (relaxed)
• !=
• &&
• ||
• !
• >, >=, <, <=
• +, -, *, /, div, rem
• <> (binary concat)
• ++ (list concat)
• -- (list diff)

Types

• 1 (integer)
• 0x1F (integer)
• 1.0 (float)
• true (boolean)
• :foo (atom)
• {1, 2} (tple)
• [1, 2, 3] (list)
• [1 | [2, 3]]
• [a: 1, b: 2] (keyword list)
• [65, 66] or 'AB' (integer list)
• << 65, 66 >> or "AB" (binary string)
• 1..9 (range)

Functions

• fn params [guard] -> body end
• function do params [guard] -> body end
• func.() (calling a anonymous function from a variable)
• &(&1, &2) (closure shortcut)
• def name(params) [guard] do expression end
• def name(params) [guard], do: expression
• parameter \\ 42 (default parameter)
• defp ... (private function)
• &module.function/arity
• defmodule ...
• require ...
• use ...
• import Module, only: foo, except: bar
• alias Module, as: M
• :erlang.function() (calling a erlang function)
• when [guard] (pattern matching guard)

List Comprehensions

• lc x inlist list, y inbits binary, x < y, do: ...
• bc ... inbits ..., guard, do: ...

Control flow

• something, do: ...
• else, rescue, try, ensure
• a |> b() (pipeline operator)
• if expr do ... else ... end
• condition do matcher -> expr end
• case expr do matcher -> expr end

Regex and Sigils

• %r{pattern]opts (regex)
• %type{content} (sigil)

Messages

• pid <- message (Sending message)
• receive do matcher -> expression after 42 -> expression end

Constants

• _MODULE_
• _FILE_
• _DIR_
• _ENV_
• _CALLER_

TODO

• ^ : Use the pin operator ^ when you want to pattern match against an existing variable’s value rather than rebinding the variable

• %{} : map

• #{} in string : run

• fun! : a function with error message

• fun? : a boolean function

• _ : default case

• _foo : a variable not used

• @proper : module attributes

• | : %{recipe | salt: "2tsp"}

• ? : return codepoint https://elixir-lang.org/getting-started/binaries-strings-and-char-lists.html