kc3-lang/kc3/test/httpd/doc/1_KC3/1.16_Map.en.md

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• Hash : 6244fe3b
  Author : Thomas de Grivel
  Date : 2025-10-21T18:32:49
  

  Make doc
  

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ikc3> a = %{id: 1, title: "My title", message: "Hello, world !"}
%{id: 1,
  title: "My title",
  message: "Hello, world !"}

ikc3> %{id: id, title: "My title", message: message} = ^ a
%{id: 1,
  title: "My title",
  message: "Hello, world !"}
ikc3> id
1
ikc3> message
"Hello, world !"

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 !"

ikc3> a[:id]
1
ikc3> a[:message]
"Hello, world !"

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 !"

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 !"}

Source

• test/httpd/doc/1_KC3/1.16_Map.en.md

• # 1.16 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 !"
  ```
  
  The bracket syntax allows you to query any key type.
  
  ```elixir
  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](../)
  
  Previous : [1.15 List](1.15_List)
  
  Next : [1.17 Ptr](1.17_Ptr)
  

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