map_keys.cr

struct NamedTuple
  macro map_keys(tuple, properties)
    {% begin %}
    %tuple = {{tuple}}
    NamedTuple.new(
      {% for key, value in properties %}
          {{value.id}}: %tuple[{{key.symbolize}}],
      {% end %}
    )
    {% end %}
  end
end

NamedTuple.map_keys({a: 1, b: "foo"}, {a: :qux, b: :bar}) # => {qux: 1, bar: "foo"} : NamedTuple(qux: Int32, bar: String)