Performance - Best practices?

Phoenix Forum Questions / Help
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Then at what point and why do they get turned into binaries? https://github.com/idi-ot/eex_test

iex(1)> EExTest.fortune_html [a: "a", b: "b"]
"<!DOCTYPE html>\n<html>\n  <head>\n    <title>Fortunes</title>\n  </head>\n  <body>\n    <table>\n      <tr><th>id</th><th>message</th></tr>\n      \n        <tr><td>a</td><td>a</td></tr>\n      \n        <tr><td>b</td><td>b</td></tr>\n      \n    </table>\n  </body>\n</html>\n"

I would’ve expected something like this

iex(3)> EExTest.custom_fortune_html [a: "a", b: "b"]
["<!DOCTYPE html>\n<html>\n  <head>\n    <title>Fortunes</title>\n  </head>\n  <body>\n    <table>\n      <tr><th>id</th><th>message</th></tr>\n",
 ["<tr><td>", "a", "</td><td>", "a", "</td></tr>", "<tr><td>", "b", "</td><td>",
  "b", "</td></tr>"], "    </table>\n  </body>\n</html>\n"]

Some tests

# render small list

iex(6)> :timer.tc(fn -> Enum.each(1..100_000, fn _ -> EExTest.fortune_html([a: "a", b: "b"]) end) end)
{480068, :ok}

iex(7)> :timer.tc(fn -> Enum.each(1..100_000, fn _ -> EExTest.custom_fortune_html([a: "a", b: "b"]) end) end)
{279135, :ok}

# render empty list

iex(10)> :timer.tc(fn -> Enum.each(1..100_000, fn _ -> EExTest.fortune_html([]) end) end)
{144888, :ok}

iex(11)> :timer.tc(fn -> Enum.each(1..100_000, fn _ -> EExTest.custom_fortune_html([]) end) end)
{74700, :ok}

# render bigger list

iex(12)> data = Enum.map(1..1000, fn i -> {i, i} end)

iex(14)> :timer.tc(fn -> Enum.each(1..1_000, fn _ -> EExTest.custom_fortune_html(data) end) end)
{277821, :ok}

iex(15)> :timer.tc(fn -> Enum.each(1..1_000, fn _ -> EExTest.fortune_html(data) end) end)
{1078125, :ok}
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