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iex> Map.replace!(example_map, :delta, "five")
** (KeyError) key :delta not found in: %{alpha: "one", bravo: "two", charlie: "three"}
    (stdlib 3.12.1) :maps.update(:delta, "five", %{alpha: "one", bravo: "two", charlie: "three"})

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iex> Map.update!(example_map, :charlie, fn charlie -> charlie <> " and four" end)
%{alpha: "one", bravo: "two", charlie: "three and four"}

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iex> Map.update!(example_map, :delta, fn delta -> delta <> " and four" end)
** (KeyError) key :delta not found in: %{alpha: "one", bravo: "two", charlie: "three"}
    (stdlib 3.12.1) :maps.get(:delta, %{alpha: "one", bravo: "two", charlie: "three"})
    (elixir 1.10.3) lib/map.ex:272: Map.update!/3

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iex> Map.update(example_map, :charlie, "three", fn charlie -> charlie <> " and four" end)
%{alpha: "one", bravo: "two", charlie: "three and four"}

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iex> Map.update(example_map, :delta, "four", fn delta -> delta <> " and five" end)
%{alpha: "one", bravo: "two", charlie: "three", delta: "four"}

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iex> example_map |> Map.put(:alpha, "eight") |> Map.put(:bravo, "nine")
%{alpha: "eight", bravo: "nine", charlie: "three"}

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iex> example_map |> Map.replace!(:alpha, "eight") |> Map.replace!(:bravo, "nine")
%{alpha: "eight", bravo: "nine", charlie: "three"}

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iex> %{example_map | alpha: "eight", bravo: "nine"}
%{alpha: "eight", bravo: "nine", charlie: "three"}

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[kind: :less_than_or_equal_to, number: 0, validation: :number]

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iex> Map.new([kind: :less_than_or_equal_to, number: 0, validation: :number])
%{kind: :less_than_or_equal_to, number: 0, validation: :number}