Hello World
IO.puts("Hello, World!")main.ex
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Elixir 1.20.1Readymain.exLn 1, Col 1Spaces: 4UTF-8
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Elixir is a dynamic, functional language created by José Valim and first released in 2011. It runs on the Erlang virtual machine (BEAM), inheriting decades of battle-tested support for low-latency, fault-tolerant, distributed systems. Elixir offers a friendly, Ruby-inspired syntax while keeping Erlang's concurrency model based on lightweight processes that communicate by message passing.
Built around immutability and pattern matching, Elixir uses the actor model and OTP behaviors like GenServer and supervisors to build resilient applications. It powers high-throughput web services through the Phoenix framework, real-time systems, and embedded software via Nerves. Its metaprogramming with macros and a polished tooling experience, including Mix and Hex, make it productive and approachable.
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IO.puts("Hello, World!")name = IO.gets("") |> String.trim()
IO.puts("Hello, #{name}!")[1, 2, 3, 4]
|> Enum.map(fn x -> x * x end)
|> IO.inspect()defmodule Math do
def add(a, b), do: a + b
end
IO.puts(Math.add(2, 3))defmodule Demo do
def classify(n) do
case n do
0 -> "zero"
n when n > 0 -> "positive"
_ -> "negative"
end
end
end
IO.puts(Demo.classify(5))
IO.puts(Demo.classify(-3))person = %{name: "Alice", age: 30}
IO.puts(person.name)
updated = %{person | age: 31}
IO.inspect(updated)
ages = %{"bob" => 25, "carol" => 28}
IO.inspect(Map.put(ages, "dan", 40))defmodule Factorial do
def of(0), do: 1
def of(n) when n > 0, do: n * of(n - 1)
end
IO.puts(Factorial.of(5))result =
1..10
|> Enum.filter(&(rem(&1, 2) == 0))
|> Enum.reduce(0, &+/2)
IO.puts(result)defmodule User do
defstruct name: "", age: 0
def adult?(%User{age: age}), do: age >= 18
end
u = %User{name: "Alice", age: 30}
IO.puts(u.name)
IO.puts(User.adult?(u))squares = for x <- 1..5, do: x * x
IO.inspect(squares)
evens = for x <- 1..10, rem(x, 2) == 0, do: x
IO.inspect(evens)
pairs = for x <- [1, 2], y <- [:a, :b], do: {x, y}
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Elixir is one of 46 single-file compiler scratchpads. Each run submits only main.ex; local sibling-file imports are not enabled.
Linked-project languages (23): Node.js, TypeScript, Deno, Python, C, Go, Dart, Swift, Rust, Ruby, PHP, Java, Kotlin, C++, C#, Nim, Crystal, Haxe, Zig, Scala, D, Bun, Objective-C.
Single-file scratchpads (46): Matplotlib, NumPy, pandas, Haskell, Clojure, Perl, Lua, Tcl, jq, Raku, Elixir, Bash, Zsh, Nushell, R, Assembly (NASM), Julia, Octave, Groovy, PowerShell, Visual Basic .NET, Odin, Pascal, Lisp, Erlang, CoffeeScript, COBOL, BASIC, V, Racket, OCaml, Prolog, AWK, Emacs Lisp, Emojicode, Forth, F#, Fortran, Assembly (NASM64), Solidity, Mojo, Ada, WASM (WAT), Gleam, Shell Script (sh), Scheme.
Download file exports the active Elixir source file.