Vitte

5. Data Structures

Level: beginner · Reading time: 3 min · Prerequisite: book/poche/04-procedures.html · Last review: 2026-05-09

TL;DR (5 lines)

  • Read the core idea first.
  • Understand one concept at a time.
  • Run small examples.
  • Fix errors early.
  • Move to next chapter only when clear.

Frequent mistakes

  • Skipping prerequisites.
  • Reading without trying examples.
  • Fixing too many errors at once.

Prerequisites: book/poche/04-procedures.html. See also: book/chapters/08-structures.html.

Goal

Group related data into a structure.

Example

form User {
  id: int
  name: string
}

Why it matters

Structures avoid scattered and confusing settings.

Quick check

What happens if you add email: string?

Try this

  1. Create User.
  2. Add a field.
  3. Adapt the user code.

If you're stuck

Start with 2 or 3 fields maximum, then evolve little by little.

See also

Next best action

Apply one idea from this chapter in a tiny example, then continue.