kc3-lang/kc3/test/httpd/doc/1_KC3/1.23_Tuple.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 = {:ok, "My title", "Hello, world !"}
{:ok, "My title", "Hello, world !"}

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

ikc3> a[0]
:ok
ikc3> a[1]
"My title"
ikc3> a[2]
"Hello, world !"

ikc3> a = {:ok, "My title", "Hello, world !"}
{:ok, "My title", "Hello, world !"}
ikc3> access(a, [0])
:ok
ikc3> access(a, [1])
"My title"
ikc3> access(a, [2])
"Hello, world !"

Source

• test/httpd/doc/1_KC3/1.23_Tuple.en.md

• # 1.23 Tuple
  
  KC3 tuples are immutable arrays of `Tag`. They contain a fixed number of
  constant values of any type. Tuple access is very fast.
  
  Tuples can be used to return more than one value from a function.
  For example a successful function call might result in a
  `{:ok, result}` tuple, while an error might produce the
  `{:error, "Message", data, trace}` tuple.
  
  ## 1.23.1 Examples
  
  ```elixir
  ikc3> a = {:ok, "My title", "Hello, world !"}
  {:ok, "My title", "Hello, world !"}
  ```
  
  Destructuring works with tuples to extract values :
  
  ```elixir
  ikc3> {:ok, title, message} = ^ a
  {:ok, "My title", "Hello, world !"}
  ikc3> title
  "My title"
  ikc3> message
  "Hello, world !"
  ```
  
  The bracket syntax allows you to query the tag at a tuple position :
  
  ```elixir
  ikc3> a[0]
  :ok
  ikc3> a[1]
  "My title"
  ikc3> a[2]
  "Hello, world !"
  ```
  
  You can also use the `KC3.access` function for the same result :
  
  ```elixir
  ikc3> a = {:ok, "My title", "Hello, world !"}
  {:ok, "My title", "Hello, world !"}
  ikc3> access(a, [0])
  :ok
  ikc3> access(a, [1])
  "My title"
  ikc3> access(a, [2])
  "Hello, world !"
  ```
  
  ---
  
  Top : [KC3 documentation](../)
  
  Previous : [1.22 Sym](1.22_Sym)
  
  Next : [1.24 Variable](1.24_Variable)
  

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