Conditional css class names

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4

I pinched this snippet from a previous dev working on my current project.

  def classes(classes) do
    classes
    |> Enum.filter(&elem(&1, 1))
    |> Enum.map(&elem(&1, 0))
    |> Enum.join(" ")
  end

Using it as

<%= some_tag "example", class: classes("is-selected": is_selected_or_something()) %>
<div class="<%= classes("is-selected": true) %>">
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