Collections

Source: examples/collections.ion in the repo.

// Collections: lists, dicts, sets, tuples

// ---- Lists ----
let nums = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

io::println(f"Sum: {nums.sum()}");
io::println(f"Min: {nums.min()}, Max: {nums.max()}");
io::println(f"Unique: {[1, 2, 2, 3, 3, 3].unique()}");
io::println(f"Dedup: {[1, 1, 2, 2, 1, 1].dedup()}");
io::println(f"Window(3): {[1, 2, 3, 4, 5].window(3)}");
io::println(f"Chunk(3): {nums.chunk(3)}");
io::println(f"Slice [2..5]: {nums.slice(2, 5)}");

// List spread
let first = [1, 2, 3];
let second = [4, 5, 6];
let combined = [...first, 0, ...second];
io::println(f"Spread: {combined}");  // [1, 2, 3, 0, 4, 5, 6]

// Enumerate
for (i, val) in enumerate([10, 20, 30]) {
    io::println(f"  [{i}] = {val}");
}

// ---- Dicts ----
let config = #{host: "localhost", port: 8080};
let extra = #{debug: true, port: 3000};

// Merge and update
let merged = config.merge(extra);
io::println(f"\nMerged: {merged}");

// Keys, values, entries
io::println(f"Keys: {merged.keys()}");
io::println(f"Values: {merged.values()}");

// Dict comprehension
let squares = #{str(n): n * n for n in 1..=5};
io::println(f"Squares: {squares}");

// Map/filter on dicts
let prices = #{apple: 1, banana: 3, cherry: 5, date: 2};
let expensive = prices.filter(|k, v| v >= 3);
io::println(f"Expensive: {expensive}");

// ---- Sets ----
let a = set([1, 2, 3, 4]);
let b = set([3, 4, 5, 6]);

io::println(f"\nSet A: {a}");
io::println(f"Set B: {b}");
io::println(f"Union: {a.union(b)}");
io::println(f"Intersection: {a.intersection(b)}");
io::println(f"Difference A-B: {a.difference(b)}");
io::println(f"Contains 3: {a.contains(3)}");

let mut s = set([1, 2]);
s = s.add(3);
s = s.remove(1);
io::println(f"Modified set: {s}");

// ---- Tuples ----
let point = (10, 20, 30);
let (x, y, z) = point;
io::println(f"\nPoint: ({x}, {y}, {z})");

// Tuples in iteration
let pairs = [(1, "one"), (2, "two"), (3, "three")];
for (num, name) in pairs {
    io::println(f"  {num} = {name}");
}