kc3-lang/kc3

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+# 1.21 Map
+
+KC3 maps are like Elixir maps, they are key-values enclosed in `%{}` :
+
+```elixir
+ikc3> a = %{id: 1, title: "My title", message: "Hello, world !"}
+%{id: 1,
+  title: "My title",
+  message: "Hello, world !"}
+```
+
+Destructuring works with maps to extract values :
+
+```elixir
+ikc3> %{id: id, title: "My title", message: message} = ^ a
+%{id: 1,
+  title: "My title",
+  message: "Hello, world !"}
+ikc3> id
+1
+ikc3> message
+"Hello, world !"
+```
+
+
+You can use the dot syntax to access map values from a `Sym` key :
+
+```elixir
+ikc3> a = %{id: 1, title: "My title", message: "Hello, world !"}
+%{id: 1,
+  title: "My title",
+  message: "Hello, world !"}
+ikc3> a.id
+1
+ikc3> a.message
+"Hello, world !"
+```
+
+You can also use the `KC3.access` function for the same result :
+
+```elixir
+ikc3> a = %{id: 1, title: "My title", message: "Hello, world !"}
+%{id: 1,
+  title: "My title",
+  message: "Hello, world !"}
+ikc3> access(a, :id)
+1
+ikc3> access(a, :message)
+"Hello, world !"
+```
+
+To update an existing map you can use Map.put like this :
+
+```elixir
+ikc3> a = %{id: 1, title: "My title"}
+%{id: 1,
+  title: "My title"}
+ikc3> a = Map.put(a, :message, "Hello, world !")
+%{id: 1,
+  title: "My title",
+  message: "Hello, world !"}
+```
+
+---
+
+Top : [KC3 documentation](/doc/)