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elixir tricks
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| # Anonymous constructor | |
| (&%{ok: &1}).(1) # => %{ok: 1} | |
| Enum.map 1..5, &{&1, &1 * 2} # => [{1, 2}, {2, 4}, {3, 6}, {4, 8}, {5, 10}] | |
| (&[1|&1]).(2) # => [1 | 2] | |
| #macro | |
| Enum.reduce items, %{}, fn item, map -> | |
| Map.update(map, item, 1, & &1 + 1) | |
| end |
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