Elixir - functional, concurrent, distributed programming for the rest of us

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functional, concurrent, distributed programming for the rest of us ELIXIR

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@whatyouhide

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functional, concurrent, distributed programming for the rest of us ELIXIR

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LET'S BUILD A LANGUAGE

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Language for modern systems

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concurrent distributed fault-tolerant extensible

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don't give to devs, enable devs

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NO TYPE SYSTEM

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CONCURRENCY

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threads are heavy

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schedulers VM processes

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memory memory

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IMMUTABLE DATA

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MESSAGE PASSING

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send(pid, message) receive do ... end +

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pattern matching

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{1, _} = some_tuple

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receive do {1, _} -> ... {_, _} -> ... end

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case expression do pattern1 -> ... pattern2 -> ... _ -> ... end

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ISOLATED MEMORY MESSAGE PASSING +

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def loop(state) do receive do new_state -> loop(new_state) end end

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DISTRIBUTION

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node 1 node 2

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FAULT TOLERANCE

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acceptor

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acceptor

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link

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link

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link

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link trap crash

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link trap crash trap crash

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SUPERVISORS

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SYNTAX

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github.com/josevalim/lego-lang

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def(double_sum(a, b), do: ( =(c, +(a, b)) *(c, 2) ))

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def(double_sum(a, b), do: ( =(c, +(a, b)) *(c, 2) ))

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def(double_sum(a, b), do: ( =(c, +(a, b)) *(c, 2) ))

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def(double_sum(a, b), do: ( =(c, +(a, b)) *(c, 2) ))

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if(>(a, b), do: a, else: b)

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macros functions +

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less parens?

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def(double_sum(a, b), do: ( =(c, +(a, b)) *(c, 2) ))

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def(double_sum(a, b), do: ( c = a + b c * 2 ))

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def double_sum(a, b), do: ( c = a + b c * 2 )

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def double_sum(a, b) do c = a + b c * 2 end

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if a > b do a else b end

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literals and containers

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[1, 2, 3] [](1, 2, 3)

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macros functions +

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def add(a, b), do: a + b

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defmacro def(call, keywords) add(a, b) do: (a + b)

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case expression do true -> branch1 else -> branch2 end

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defmacro if(condition, do: branch1, else: branch2) do quote do case unquote(condition) do true -> unquote(branch1) false -> unquote(branch2) end end end