Game Logic

Source: examples/game_logic.ion in the repo.

// Game logic example — RPG damage calculation

fn calculate_damage(attacker, defender) {
    let base = attacker.attack - defender.defense;
    let damage = if base < 1 { 1 } else { base };

    // Critical hit check (simulated)
    let is_crit = attacker.luck > 7;
    let final_damage = if is_crit { damage * 2 } else { damage };

    #{
        damage: final_damage,
        is_crit: is_crit,
        attacker_name: attacker.name,
        defender_name: defender.name,
    }
}

fn apply_damage(entity, damage) {
    let new_hp = entity.hp - damage;
    entity.insert("hp", if new_hp < 0 { 0 } else { new_hp })
}

fn is_alive(entity) {
    entity.hp > 0
}

// Set up combatants
let hero = #{name: "Hero", hp: 100, attack: 25, defense: 10, luck: 8};
let goblin = #{name: "Goblin", hp: 40, attack: 12, defense: 5, luck: 3};

// Combat round
let result = calculate_damage(hero, goblin);
io::println(f"{result.attacker_name} attacks {result.defender_name}!");
if result.is_crit {
    io::println("Critical hit!");
}
io::println(f"Deals {result.damage} damage.");

let mut goblin = apply_damage(goblin, result.damage);
io::println(f"{goblin.name} HP: {goblin.hp}");

if !is_alive(goblin) {
    io::println(f"{goblin.name} has been defeated!");
}