paiza.ioでelixir その233

概要

paiza.ioでelixirやってみた。
良いコードを見つけたので、やってみた。

参考にしたページ。

サンプルコード

if String.valid?("Hello") do
    "Valid string!"
else
    "Invalid string."
end
|> IO.inspect
if "a string value" do
    "Truthy"
end
|> IO.inspect
unless is_integer("hello") do
    "Not an Int"
end
|> IO.inspect
case {:ok, "Hello World"} do
    {:ok, result} -> 
        result
    {:error} -> 
        "Uh oh!"
    _ -> 
        "Catch all"
end
|> IO.inspect
#case :even do
#    :odd -> 
#        "Odd"
#end    
|> IO.inspect
case :even do
    :odd -> 
        "Odd"
    _ -> 
        "Not Odd"
end
|> IO.inspect
pie = 3.14
|> IO.inspect
case "cherry pie" do
    ^pie -> 
        "Not so tasty"
    pie -> 
        "I bet #{pie} is tasty"
end
|> IO.inspect
case {1, 2, 3} do
    {1, x, 3} when x > 0 ->
        "Will match"
    _ ->
        "Won't match"
end
|> IO.inspect
cond do
    2 + 2 == 5 ->
        "This will not be true"
    2 * 2 == 3 ->
        "Nor this"
    1 + 1 == 2 ->
        "But this will"
end
|> IO.inspect
cond do
    7 + 1 == 0 ->   
        "Incorrect"
    true -> 
        "Catch all"
end
|> IO.inspect
user = %{first: "Sean", last: "Callan"}
|> IO.inspect
with {:ok, first} <- Map.fetch(user, :first), {:ok, last} <- Map.fetch(user, :last), do: last <> ", " <> first
|> IO.inspect
user = %{first: "doomspork"}
|> IO.inspect
with {:ok, first} <- Map.fetch(user, :first), {:ok, last} <- Map.fetch(user, :last), do: last <> ", " <> first
|> IO.inspect
#case Repo.insert(changeset) do
#    {:ok, user} ->
#        case Guardian.encode_and_sign(user, :token, claims) do
#            {:ok, jwt, full_claims} ->
#                important_stuff(jwt, full_claims)
#            error ->
#                error
#        end
#    error ->
#        error
#end
|> IO.inspect
#with {:ok, user} <- Repo.insert(changeset), {:ok, jwt, full_claims} <- Guardian.encode_and_sign(user, :token, claims), do: important_stuff(jwt, full_claims)
|> IO.inspect
#import Integer
|> IO.inspect
#m = %{a: 1, c: 3}
|> IO.inspect
#a = with {:ok, number} <- Map.fetch(m, :a), true <- is_even(number) do 
#    IO.puts "#{number} divided by 2 is #{div(number, 2)}"
#    :even
#else
#    :error ->
#        IO.puts("We don't have this item in map")
#        :error
#    _ -> 
#        IO.puts("It is odd")
#        :odd
#end
|> IO.inspect

実行結果

"Valid string!"
"Truthy"
"Not an Int"
"Hello World"
"Hello World"
"Not Odd"
3.14
"I bet cherry pie is tasty"
"Will match"
"But this will"
"Catch all"
%{first: "Sean", last: "Callan"}
"Callan, Sean"
%{first: "doomspork"}

成果物

以上。